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I have 1991 GMC topkick 7c, its been running rough, no power going up hill and finally died while driving today. Idiot light saying "engine overspeed" is coming on now and wont start back up. Any idea what might be wrong?

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 188 Answers

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.

Posted on Feb 02, 2009

  • 15 Answers

SOURCE: 2002 grand prix runs rough,dies service engine

sounds like you have a vacuum leak, check all the vacuum hoses and replace any broken or kinked ones, also check around the intake manifold gasket for leaks. any air leaks after the air flow meter creates 'un-metered' air which inturn will make the car run rough and stall, hope this helps

Posted on Apr 04, 2009

  • 3 Answers

SOURCE: 2000 f-250 running rough, overdrive light flashing

check for a loose ground coming off your computer...i had the same problem and ford had to change the computer...well it turned out to be a loose ground..

Posted on May 07, 2009

ourhowse
  • 2007 Answers

SOURCE: 1995 GMC Topkick starts and dies immediatly. Fuel

Mass air flow sensor.

Posted on Oct 06, 2009

fishdoctorfi
  • 178 Answers

SOURCE: 2006 GMC Envoy Engine light comes on in cold

Had the same prob. Mine was the O2 sensors..... I replaced Both and [knock on wood] have had no more probs.......

Posted on Dec 21, 2009

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