'99 burb runs terrible - surge - cut out - miss fire

If anyone can help before I pull out all my hair. I have a '99 burb, 5.7 - intake was leaking (big surprise).
I replace intake gasket, ran great (major pat on back), two days later surging - skipping - missing at all speeds.
When I replaced the gasket I also changed plugs, plug wires, cap and rotor.
Tried some remedies listed here, Seafoam and such.
My mechanic drove it and suggested updating the fuel injection spider, so I did.
Ran great for 2 days, now same problem. I have read about fuel pump, egr and distributor but I didn't have a problem before.
I would greatly appreciate any suggestions.

Welcome to AF. Start with checking the fuel pressure, look for 60-65 at the rail.

As Max said, fuel press is #1 to check. I've not done a 5.7 but I assume the dist has to come out for the gasket change. That would be the 2nd thing I would check. Need a scan tool that can access "cam retard or cam offset".

When in this mode timing needs to be set at 0 +/- 2 degs with eng rpm's at or above 1000.

Welcome THDH. I feel your pain I have the same vehicle same repair and it started missing. Mine misses in higher gears especially when towing and when wet outside. When you find out what it is please advise.

Thanks for the great advise, over the past couple of days I have noticed the problem is only when raining, possibly when towing but I haven't had the opportunity to try.

With moisture being a clue, wouldn't that be distributor?

Well after mucking around a bit, I finally got a SES light.
The ETC sensor was showing -40F and spiking to 200F, put one on and so far so good. Everything seems fine for now.

"thadh". Thank you for the post back on what fixed your troubles. Something new learned for me and hopefully a bunch of others...........Steve

ive got a 2000 silverado 5.3 it started backfirein so ive change the crankshaft sensor and now it has a miss to it but when i check for codes
the only thing that reads is the knocksensers but ive had those changed
about a 3 mos ago noow it wants to hesitate on take of but any other speeds it runs fine can any think of what it could be ive even changed plugs and wires?

ive got a 2000 silverado 5.3 it started backfirein so ive change the crankshaft sensor and now it has a miss to it but when i check for codes
the only thing that reads is the knocksensers but ive had those changed
about a 3 mos ago noow it wants to hesitate on take of but any other speeds it runs fine can any think of what it could be ive even changed plugs and wires?

what dtc check engine light codes do you have today ?

your problem today is hesitation from stop, correct ?

do you wash your engine ?

he thing is i dont have catilac converters i have flowmaster ran so my check egine light stay on but the only code that pulls up reads my knock sensor but had them replaced all ready and no i dont wash my egine and yeah from stop to take off it hesitate until it reaches about 20 -30 mph then it is like it kicks in but like isaid i've already changed my plug;wires;and my crankshaft sensor and now it misses when idlein and hesitate on take off also to when i changed my cks io notice that my crank shaft sensor wire looked like it had burned in two so i rewired it and i notice that my hot wire on cks seemed like it had a weak connection cause when i put a test light on my hot the test light didnt shine very bright but my grounds are good if u could help i would appreciate it

he thing is i dont have catilac converters i have flowmaster ran so my check egine light stay on but the only code that pulls up reads my knock sensor but had them replaced all ready and no i dont wash my egine and yeah from stop to take off it hesitate until it reaches about 20 -30 mph then it is like it kicks in but like isaid i've already changed my plug;wires;and my crankshaft sensor and now it misses when idlein and hesitate on take off also to when i changed my cks io notice that my crank shaft sensor wire looked like it had burned in two so i rewired it and i notice that my hot wire on cks seemed like it had a weak connection cause when i put a test light on my hot the test light didnt shine very bright but my grounds are good if u could help i would appreciate it

do not use test lights on these electronic computer controlled componets...only use a volt/ohm meter..

any wiring and connectors damaged must be repaired or replaced...wires broken must be soldered and properly sealed with a heat shrink ,material...

if you want some help you must supply the exact codes so that the forum members can direct you correctly...also in the sequence that they are recorded...

do not use test lights on these electronic computer controlled componets...only use a volt/ohm meter..

any wiring and connectors damaged must be repaired or replaced...wires broken must be soldered and properly sealed with a heat shrink ,material...

if you want some help you must supply the exact codes so that the forum members can direct you correctly...also in the sequence that they are recorded...
so what is the volts or ohms for the cks wires im not sure the codes any more but i can find out by goin to autozone