Keith Brower
Newbie
I have a 98 chevy 3500 with the 3.7 vortec and as it gets colder here in Nevada when we try to start it, it will run super rough and sometimes backfires in the cad. If you slowly add throttle till you can get it up to 2k rpm and hold it there for a while, 2 minutes, it will then idle down and run great. We took it to a shop and the parts bombed it with new distributor wires plugs MAP MAF and new o2 sensors and a new drivers side cad. We got it back 3k later and it still does it. So I changed the Tps and idle air cleaned the throttle body, and replaced the spider under the intake manifold. Still doesn't run good at the beginning of the day but then runs great all day after the initial start up issues. Any ideas on where I go from here? Is it an ECU issue? Please help and I thank you all for any input you can give me. Oh yeah, I changed the fuel pump too to get me at 60psi
Thanks again
Thanks again