Question about 1999 Chevrolet Silverado 1500

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I having a problem with my 1998 Chevy Silverado truck. It boggs down when I try to accelerate. Sometimes my best speed is 20 mph. If I turn off the engine and re-start, it goes away and comes back after a few miles. Here are the particulars... 1998 Chevy Silverado Ext Cab 5.7 L V8 Automatic 4WD 142,000 miles. I have already changed both catalytic converters, all four O2 sensors, and mass air flow sensor. Did a fuel pressure test. It reads 55 psi. Changed fuel filter just in case. My "Service Engine Light" is off. So I assume there are no codes. What else could it be? Please help, Shane

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  • Chevrolet Master
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Check the fault codes anyway. Did you do this fuel pressure testing while the loss of power was occurring? If no the test is invalid.

Posted on Apr 20, 2017

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Posted on Jan 02, 2017

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SOURCE: 1998 Chevy s10 4 cylinder running rough

One thing to check is the fuel pressure regulator.
If the diaphram is leaking it will cause gas to be pulled into the vacuum system causing lots of white smoke and extreme rough running.

Posted on Mar 03, 2009

motor1258
  • 6674 Answers

SOURCE: accelaration loss of power

I'd have a fuel pressure test done to be sure, it isn't fuel related again. Takes 5 or 10 minutes so cost should be minimal. The other thing that comes to mind is a plugged exhaust. (catalytic converter) Quite possible on a 10yr.old vehicle.

Posted on Apr 11, 2009

  • 37 Answers

SOURCE: loss of power

You should have your cat. checked make sure there is no restrictions in your exhaust system.

Posted on Apr 11, 2009

bitchn65cuda
  • 70 Answers

SOURCE: 1996 s10 2.2 engine starts but idles rough and will not rev up.

Hi! You must be frustrated by now! your code is marking that the O2 sensor is bad in bank 1. Did you replace the O2 sensor that is located  before the catalytic converter?  The S10 has an O2 sensor specially made for that cat. its about 30$ That would explain for your blackened spark plugs; your pc on the car is asking for more fuel. GOOD LUCK!!

Posted on Apr 29, 2009

dnewcombe1
  • 1564 Answers

SOURCE: Engine surge at 45-55 mph on 2002 Silverado 5.3l engine

I would start looking for a vacuum leak. Check all the vacuum lines for cracks or breakage. Spray penetrating fluid on them until you hear the engine start to stumble then focus the spray on that area until you are able to pinpoint the location of the leak. Best of luck,my friend, Dana

Posted on Aug 31, 2009

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