Question about 1999 Chevrolet Silverado 1500

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1997 chevy 2500 4x4 stumbles

My truck will idle smooth but upon any acceleration it stumbles, kinda just cuts out and doesnt want to go. Ive changed the cap, rotor, plugs, fuel filter and fuel pump relay and neither seem to have helped. Sometimes it wont start, just crank and crank and then if you wait a bit it will fire right up, then when you turn it off it wont start again. I can hear the fuel pump with the key in the on position, seems to be louder than normal. the service engine light has just come on, and then it ran fine for a couple miles and went off then started running poorly again.

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Fuel pump is most likely the cause. Probably just barely making the required pressure to start. Needs to maintain 60-66 psi while cranking to start.

Posted on Dec 21, 2008

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Engine stumbles only in no load circumstances. Idles smoothly, and stumbles only in no


no miles stated, 400k miles> or 100 = 100k?
if any 95 has 100k miles that be like a new car. no ?
5k /year, wow...
trouble is i cant drive car. and see this effect.

the issue is acceleration, right? :called Hesitations !
and only happens on a hot engine , yes?
and never happens wide open throttle.? correct?
HAPPENS:
only when tipping in the throttle at cruise. (then self corrects )
THE TPS sensors does that.
The TPS is a demand sensor. it sees driver DEMAND
acceleration, and this is detected and the PCM goes to ENRICH mode. this is done or the engine goes LEAN until the MAP BARO READINGS, catch up and correct fueling.
that is my wild useless guess. (not driven and me not scanning the PCM while it fails.)

The TPS is a rate of change sensor.
This is because all air meters made are slow.
The TPS hides this fact. until bad.
there are other causes,but im not there with my scan tool..
and (box of gauges)

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