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Anonymous Posted on Jun 12, 2017

99 gmc engine starts idles rough then boggs and dies when you give it gas

Driving home one day the truck started acting funnny then the power died. replaced the battery now the truck will start but has a rough idle when you give it fuel it boggs out then dies. no codes are comming up, also replace air filter as the truck smells like gas alot almost like it floods itself out. checked all cylinders for good spark and they are all fine no issue there. sometimes when the truck stays running for a few seconds it will also backfire then die.

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Jeff Armer

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  • GMC Master 15,575 Answers
  • Posted on Jun 12, 2017
Jeff Armer
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Joined: Nov 22, 2012
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What engine ? 4.3 , 4.8 , 5.3 or 6.0 l What fuel injection system ? What is the fuel pressure ? Do you know what fuel trims are ? The fuel pressure regulator's are prone to leaking to leaking on thses SPI injection system./
How to identify and repair leaking fuel pressure regulator GM CPI system...

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Anonymous

  • Posted on Sep 06, 2008

SOURCE: Engine will start and rough idle but dies when either the brakes are applied or the lights are turned on!

have you checked out your fuel filter? I had my 2003 denali do the same type of problem and it turned out to be a very dirty fuel filter.

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Anonymous

  • 188 Answers
  • Posted on Feb 02, 2009

SOURCE: Truck losing power and service engine soon light on

Like to other guy said, give it a tuneup. Also try SEAFOAM to clean carb up of slug. Also check to make sure the butter fly for the choke has not come loose, causing it the choke it down. Failed choke pull-off.

hwymotors

  • 15 Answers
  • Posted on Sep 01, 2009

SOURCE: 1995 safari van w stalls when giving it gas.

maybe your iac valve is not working? it takes place of a choke or temp sender to computer could be bad which controls t I.A.C. known as the idle control valve,do you have any codes?

Anonymous

  • 1 Answer
  • Posted on Jan 07, 2010

SOURCE: Truck starts, runs for 5-10 seconds, then dies

take out your mass airflow sensor located on air intake pipe and clean with brake cleaner also is your engine light on?

Anonymous

  • 395 Answers
  • Posted on May 23, 2010

SOURCE: 4.3 L will not idel

check the Idle Stop Solenoid

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TRUCK DIED WHILE DRIVING

If you felt a loss of power, you had to press on the gas harder before it died, you may want to check on the fuel filter.  Otherwise you may want to check on the fast idle valve or pcv if it needs cleaning, or vacuum hoses if they have leaks which may be the cause of the rough idle if its an EFI engine. 
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Truck losing power and service engine soon light on

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