1990 chevy silverado running rough and dying after road test

65

Asked by Jul 29, 2014 at 02:51 AM about the 1990 Chevrolet C/K 2500 Silverado Extended Cab LB 4WD

Question type: Maintenance & Repair

She sat for two years before I bought
it. I've replaced the fuel filter, air filter,
oil change and oil filter, spark plugs,
and battery. When going in reverse, if
you put very little pressure on the gas
to back up slow it will start to chug
and run real rough and eventually
die. The same thing happens while in
drive as well. While going at low
speeds and I let off the gas it starts
to chug and want to stall before just
barely catching itself. Runs great on
the highway. However, 80% of the
time I pull into a parking lot or gas
station after driving for 15/20 minutes
or so it'll die. I'm kinda stumped on
this problem, any ideas?

5 Answers

32,785

Have you checked the fuel pump? And why was it sitting for so long. Any history will help

65

I haven't checked the pump, Ive been trying to rule everything out before I change the fuel pump because they are a little pricey. The truck used to be a work truck and has definitely seen better days. It sat for so long because the guy bought a new truck and just didn't drive it anymore. Could it be the throttle body? Or maybe a air filter gasket? Also yesterday it would not shift out of 1st gear no matter what. It's an automatic and has the proper amount of tranny fluid and I bought some Lucas oil but I haven't put it in yet. It's the first time it's done that so far

65

The miles have maxed out and no longer roll, the truck has great potential and idles fine. It only chugs when the gas is barely being pushed

1 out of 1 people think this is helpful.
32,785

Yeah, you have some exploring to do. May I suggest you change the transmission fluid.

check shift solenoids on tranny and if fuel is good at rail check crank position sensor or somewhere in the electrical.

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