2000 astro misses when cold

[buckhuntermatt]

i have a 2000 astro with 113,000 miles i have replaced fuel pump, filter, new plugs wires distributor cap and rotor. i checked fuel pressure and have all the right numbers as far as i can tell from posts i have read. my problem started a few weeks ago when the van hesitated like it wasnt getting fuel when pulling out on higway while still a little cold. it then tryed to die completely. it then cleared up and didn't act up all day. i put dry gass and filled tank up cause it only had a 1/4 tank i thought moisture in gass was problem. well next morning it wouldn't start at all. after setting all day it started hard that eveneng. i then bought a new fuel filter and drove it for a few days. it then tried to die on me going up a hill after van was warm and it didn't completely quit then ran fine. i then changed fuel pump and put new wires and plugs and dist cap and rotor and hoped it was ok. i checked fuel pressure and it looked on the low side on old pump and that is why i changed it. well after i did all this it hasn't died at all but it has a slight miss when first accelerating cold and i don't know where to look now. please help!!!

[jwjoerugby]

the tps sensor maybe? I had some problems similar to what you stated and it turned out it was the throttle position sensor. Im no expert though so don't quote me good luck though

[Blue Bowtie]

Scan the PCM for misfire history. If there is history on a specific cylinder (s), that may indicate a localized problem. If there is only a general misfire history (all cylinders) it may be a general problem, like fuel delivery, ignition, primary power, coil failures, etc.

[buckhuntermatt]

thanks for the replys. i had the codes checked and none show up. it seems to run great ecept when first pulling out while cold then it clears up.

[old_master]

What brand of wires, cap, rotor, plugs and pump did you use? What is the fuel pressure and does it hold after the pump shuts off?

[buckhuntermatt]

the plugs are ac delco platinum. wires and dis and cap are a/c delco also i think. fuel pump is aftermarket from napa. fuel pressure is 62 with key on and then it drops to 58 after pump kicks off it holds for at least 5 min after key is off. the old pump that i replaced would pump to about 61 then drop off to 54 and then within a minute start droping slowly down. i thought the new pump might have been the ticket and it hasn't been cutting clear out anymore but it does miss a little when i first take off in morning and then runs fine.

[old_master]

Do you have a scan tool available to you that is capable of watching each individual sensor?

[buckhuntermatt]

well all seems well with the van as of now it has not acted up for a couple of days. i filled her up with high test and ran some injector cleaner thru and it seems to be ok i thank you all for your help and will report back if i find anything els out