I have owned foriegn cars, gms, and fords. I have never had this much of an issue troubleshooting a vehicle. Nothing i do to this thing seems to make a bit of difference. Its an 88 d150 with a 318. Its running just like it did the day i brought it home with 1700 bucks in new parts in it. A few days ago when it got warm it started to run great warm, perfect, but now that its cold its running like crap. Even when it should be warmed up its running like crap. I can't figure it out. Check out my other posts to see the parts i put into this God forsaken truck. I just changed back to champion plugs and it still running like garbage. It was timed a few days ago and ran pretty decent. I checked to make sure there were no plug wires crossed and there is not. I'm running out of ideas quickly. Its running EXTREMELY rich. I changed the o2 sensor as you would know if you read my post as to what i've changed in this truck. I am not putting out any trouble codes. GM's seem to be pretty cut and dry if there is a problem. I can't figure this thing out to save my life. Please help.

 

My 91 Dakota 318 was temperamental. I even had to replace the e.c.u. I think 88-91 were bad years for fuel injection.
My Dad has 2 ramchargers. The 87 always dependable(carbed) He's had it a long time. We just got the 88. We did some minor work and it still doesn't run right. Dad decided he's going to stick with the carb. We're building one out of the 2. His is rusted out bad.

 

Same with mine only it wouldn't start at all when cold and then quit string all together, just crank. Was Computer, replaced everything under sun before i got to that. Fuel pump, filter, relays, 02 sensor, regulator, and finally found crank wire rubbed bald and shorted computer out.