Truck running poorly, backfiring, stalling NEED HELP!!! PLEASE

[Johnbalderas90k1500]

I have a 1990 k1500 well here is the story. I got this truck unsmogged and was In the process of getting it smogged. I took it to get it smogged and it failed to high of nox. I took it to my school (UTI) and I had the smog and emissions class look at it and the nox was way too high and my timing was 2 degrees after. Well futher diagnosis led to a bad egr valve I searched around and found the right one and replaced it. The next day I took it to Get it smogged and it passed mind you the truck was running pretty good this whole time nice and steady idle not missing. Well anyways I went home after getting it smogged and I parked it in the drive way and came back a few hours later and it started running horribly it won't even stay running for more than 10 seconds. It backfires through the intake sometimes and just runs erratically I can't even drive it. I pulled the dist. Cap and the rotor was burnt to crap so figured that was it replaced that and it didn't fix a thing. I am stumped pretty much I am gonna test the fuel pressure And see where it's at. Any ideas or suggestions are greatly appreciated. Oh almost forgot sometimes when I parked it on a hilll like a steep driveway it wouldn't start I would have to put it in neutral and roll off the incline to start it oh by the way it's a 350 motor

 

[strawberry]

i would check all your vac lines running to your egr and map sensor, also ive got these symptoms from a bad control module on the dist. or knock sensor before.

 

[Toms94z71]

ok i would check your dist clamp and make sure its not loose, my friend had that happen on his 91 when the clamp was loose and his dist moved on him.

 

[Fobroader]

My buddy had the coil wire come loose and his truck ran like a toilet and finally died at a light when the wire came loose.

 

[90-scott]

Just fixed similar problem on my 90 k1500. Turned out it was a combo of bad ignition control module and a bad map sensor.

 

[bigtmoney]

When you put the dizzy back in, did you set the timing to 0 degrees with the wire unplugged at the firewall?

 

[Johnbalderas90k1500]

It was an ignition module . Now it runs but fuel pressure is too high it's at 17 pounds.