It starts fine, if I stay with it, negotiate the gas pedal for a few seconds it wil usually keep idling smoothly. Until I put it into gear?

Asked by Mar 21, 2017 at 03:31 AM about the 1995 GMC Sierra 2500 2 Dr C2500 SL Standard Cab LB

Question type: Maintenance & Repair

(1995 GMC Sierra 2500 Pickup, 305 V8, Automatic Transmission, rear wheel
drive, 85,000 miles) Once in gear it will normally require me lightly pumping
the gas to keep from dying. Too much gas and it bogs down and requires
additional gas pedal work. it doesnt want to pick up speed from a stop and
after I get it past the bogging down point I can floor it and it will sound like i
floored it but only accelerates at 50% of the speed it would normally. When it
shifts gears it drives fine until i come to a stop again. After 10 minutes, the
engine warms up and it isn't as bad.  I have replaced the oxygen sensor,
spark plugs, fuel filter, air filter, fuel additives to clean any and everything and
I have run through 3 tanks of gas, it is still messed up. It gave me trouble
codes #13 & #44 I changed the Oxygen Sensor & cleared the codes. It gave
me trouble code #44 a few days later.

3 Answers

75,595

Running lean. Take the TBI off and check the base gasket, could be bad, snug up the intake manifold bolts, and check the vacuum lines to see if the connections are cracked.

1 of 1 people found this helpful.

Thanks for responding. I have replaced the oxygen sensor, spark plugs, fuel filter, air filter, PCV Valve, Distributor Cap and rotor so far. It ran a little better than yesterday but still has the problem. Yesterday is was pretty bad. During the rain. I purchased a new base gasket for the TBI and will change that , snug up the manifold bolts ans recheck the vacuum lines for cracks tomorrow. Thanks again

75,595

Let me know how it turns out...

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