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1996 chevy silverado 350vortec start and idle good,but when driving 30-40 when i push down on the gas it bogs down and act like it wont to cut off.

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  • Contributor
  • 32 Answers

Here's a thought that I haven't heard mentioned yet. It's quite possibly the oil presure sensor near the oil filter. It's a safety feature I believe. So that if your in an accident and the motor stops That sensor tells the ECM to stop pumping fuel

Posted on Mar 02, 2015

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  • Cars & Trucks Master
  • 2,620 Answers

Check your fuel pressure because that sounds like a weak fuel pumpor clogged fuel filter.The fuel pressure should be 60-66 psi with the key on and engine off.

Posted on Nov 03, 2012

  • Mike Bass Nov 04, 2012

    I have chang the fuel filter, but will let you know when i do the fuel pressure test . Thanks

  • Ricky Peters
    Ricky Peters Nov 04, 2012

    The fuel pressure test valve is at the rear of engine drivers side near the distributor.

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Posted on Jan 02, 2017

3mac
  • 61 Answers

SOURCE: 1996 Chevy Express 1500 w/5.0 bogging only when warm.

The cylinder 7 misfire is likely a symptom of the problem, not the problem itself.

Typically, the catalytic converter has an oxygen sensor in front and behind it. When the vehicle is warm and running in closed loop mode, the upstream oxygen sensor waveform reading should fluctuate. The downstream 02 sensor reading should be fairly steady. Typically the P0420 code triggers the check engine light if the readings of the two sensors are similar. This is indicative of (among other things - such as faulty sensors in the "emissions loop") a converter that is not working as efficiently as it should be.

I do not believe that it is a problem with a valve/head gasket or cam.

Posted on Jan 13, 2009

  • 195 Answers

SOURCE: 99 chevy silverado Unstable idle when it worms up

Hello;
It sounds as if you have a small vacuum leak some where in the intake system. Also since you cleaned the throttle body also clean the MAS. It is located between the air filter housing and the throttle body. Hope this helps, rate me highly.
Thanks;
Rich
RPM Northwest

Posted on Feb 07, 2009

  • 10 Answers

SOURCE: 1996 chevy silverado z71 electronic transfer case wont work

It's the transfer case vacuum switch. Easy fix.

Posted on Jun 17, 2009

pippall
  • 1486 Answers

SOURCE: 1987 chevy S10 engine idle problem

relace the throtle air idle valve.The temp switch will allso cause this problem.

Posted on Jul 19, 2009

  • 6 Answers

SOURCE: 1990 Chevy Scottsdale 1500 wont idle when first starting cold

ICM idle control module, loc throttle body, it may be dirty, remove clean or replace, its easy..

Posted on Jul 29, 2009

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1996 Chevy Express 1500 w/5.0 bogging only when warm.


The cylinder 7 misfire is likely a symptom of the problem, not the problem itself.

Typically, the catalytic converter has an oxygen sensor in front and behind it. When the vehicle is warm and running in closed loop mode, the upstream oxygen sensor waveform reading should fluctuate. The downstream 02 sensor reading should be fairly steady. Typically the P0420 code triggers the check engine light if the readings of the two sensors are similar. This is indicative of (among other things - such as faulty sensors in the "emissions loop") a converter that is not working as efficiently as it should be.

I do not believe that it is a problem with a valve/head gasket or cam.

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