Help with 98 silverado randomly shutting off

[Deathwyrm83]

Hello first post here just wondering if I could get any help with my 98 silverado it started just randomly shutting off on me while driving ive put a new fuel pump and filter in it about 6 months ago but this is the first time ive had any issues from what ive been reading it sounds like a crankshaft sensor or camshaft sensor I can give more detail of the truck and whats happening if needed just ask not sure what all to put here but any help would be great also the only codes im getting are P0420 and P0430.

[MikeCStig]

Both of those codes point to catalytic converter issues. Literally P0420= 'catalyst system low effeiciency bank 1' P0430= ' catalyst system low effeiciency bank 2'. It's probably clogged or something. Important- never just throw out a catalytic converter. Take it to a scrap yard that buys scrap metal and even if it's completely shot, it's still worth a good chunk of change because there's still platinum in there.

[Deathwyrm83]

that wouldnt cause it to just randomly shut off sometimes while driving though would it?

[MikeCStig]

If the clog is bad enough it could. Ever heard of the prank where you jam something (most commonly a banana) in someone's tailpipe? The engine might not even start and if it does it wont stay running long. A clogged cat has a similar effect of causing excessive backpressure. Maybe not as extreme as the fruit-in-tailpipe prank, but still if your engine can't breathe both in AND out at all times, it's going to start shutting down on you.

[j cAT]

Originally Posted by Deathwyrm83

that wouldnt cause it to just randomly shut off sometimes while driving though would it?

the codes are converter . because the vehicles drives good but will die intermittently then I would re check your fuel pressures... key on eng off 60-65 psi on the OBS 1998 gm trucks ..

6 months ago you replaced fuel pump common failures AIRTEX PUMP,IMPROPER WIRING HARNESS SPLICING ,BAD GROUND AT FUEL TANK,BAD FUEL PUMP RELAY.

DO NOT USE AIRTEX EVEN IF ITS FREE !

[Deathwyrm83]

found the problem it was the plug going into the ICM one of the connectors was bent out of shape

[j cAT]

Originally Posted by Deathwyrm83

found the problem it was the plug going into the ICM one of the connectors was bent out of shape

someone screwed up on the install .. make sure the ICM has thermal compound .