ezmobee
Supreme Mariner
- Joined
- Mar 26, 2007
- Messages
- 23,767
I have a 1990 Chevy K1500 truck (TBI). I just had a new Jasper engine installed in it. It originally had a 305 and I have upgraded to a 350. Before I did this I did some research on the internet and read somewhere that the 350 upgrade should be a direct bolt-up but that the fuel injector, EPROM in the computer (not the computer itself), and knock sensor would need to be replaced. The shop that did the work checked with Jasper and were told these things were not necessary. I picked up the truck today and my problem is this: When I first start it it idles kinda rough. When I first start driving it it stumbles a little bit. However after just a minute or two it runs great (awesome actually) and idles quite nicely as well. Do you think these other components need to be replaced? It is definitely an electronic issue because it doesn't seem to have anything to do with the engine "warming up" or anything like that. I could turn it off and restart it and it would immediately go into the rough running again for a minute or two.
Other than this problem I am thrilled with my upgrade. My 305 was in pretty bad shape and this has really breathed new life back into my old truck.
Other than this problem I am thrilled with my upgrade. My 305 was in pretty bad shape and this has really breathed new life back into my old truck.