1990 Chevy Silverado not a loss of power but not going thre

Tiny
$COTTY
  • MEMBER
  • 1990 CHEVROLET SILVERADO
  • V8
  • 4WD
  • AUTOMATIC
  • 129,778 MILES
OK so when I start up my truck it start up at the turn of a key runs nice idles fine and sounds good when I rev it the rpm go up smoothly it runs like there isn't a problem but when I put in it the D with the O around it and the regular D and drive down the road the 350 will not rev over 1500 rpm like for example in first gear it revs up to 1000 kinda stumble then move to 1500 then a the last second before it shifts the rpm jumps a little like from 1500 to what looks like 1700 or 1800 then it shifts then the rpm drops down to 500 rpm then slowly builds back up it does this threw all 4 gears now when I put it in 1 then I can rev it up to 3000 rpm then I shift it in to 2 then do the same thing then shift it in to D then I cant bring it above 1500 again also my exhaust sounds a little different kinda like a sprinkler but a little faster pace and it gets faster with the rpm by the way I had dual exhaust and I don't know how old the setup is. I changed the plugs wires cap rotter air filter fuel filter and fuel pump the sending unit was also replaced and checked and rechecked the timing (unplugged the est wire first) I redid the seal around the intake manifold I have no idea what the problem is I just got it and im dieing to hot rod it can you please help
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Thursday, October 14th, 2010 AT 5:21 PM

5 Replies

Tiny
JACOBANDNICKOLAS
  • EXPERT
Has the check engine light come on? Have you checked fuel pump pressure?
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Thursday, October 14th, 2010 AT 6:35 PM
Tiny
$COTTY
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No I do not have a check engine light and as far as a pressure test I did a 3000 rpm burnout the other day and instead of a sprinkler its more of chugging down the road I think that better describes it
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Thursday, October 14th, 2010 AT 6:49 PM
Tiny
JACOBANDNICKOLAS
  • EXPERT
I still need you to check fuel pump pressure. As far as the problem, is there ever any black smoke coming from the exhaust?
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Friday, October 15th, 2010 AT 7:12 AM
Tiny
$COTTY
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Alright how would you go about testing the fuel pressure and no you can see smoke come out out of my exhaust unless if its early in the morning and the smoke is white but im pretty sure that normal.

When I start it the truck kinda revs from 500 to 1000 repeatedly then but when it warms up to stops but I think that is a different problem because it wasn't going threw the gears right before this happened
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Friday, October 15th, 2010 AT 12:00 PM
Tiny
JACOBANDNICKOLAS
  • EXPERT
Based on everything you have mentioned, to me it sounds like one of three problems, the idle air control valve, throttle position sensor, or a fuel pressure issue. Please understand, it is hard when I am not there to experience the problem with you.

As far as fuel pressure, it is easy to check. The only thing you need is a pressure gauge. Most parts stores will lend or rent them to you.

Here is a video (how to) for checking both fuel pressure and the regulator. Please check both.

http://www.2carpros.com/how_to/how_to_check_fuel_pressure.htm
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Friday, October 15th, 2010 AT 1:39 PM

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