Question about 1995 GMC Sierra

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Engine light on. Hard shift. rough idle. revving.

Once I turn on my truck the check engine light comes on. Once its in drive it kicks into gear like a mule. It has a rough idle. Misfires. It has a high rpm at just idle and it revs about 5rpm constantly even while driving. I replaced the coolant sensor pigtail because I thought it has something to do with it. Now the light just stayed on. I'm positive I didnt cross the wires for it. I'm thinking it might be the MAP sensor or something electrical.

Posted by Anonymous on

6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 4 Answers

SOURCE: The check engine soon light

Check the ignition coil.

Posted on Aug 10, 2008

  • 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

  • 54 Answers

SOURCE: Check engine light is on and high idle (1500rpm)

Check for a vacuum leak.

Posted on Feb 03, 2009

  • 71 Answers

SOURCE: 92 chevy truck 5.7 idle revs up and down high emissions

sounds like a vacuum leak check hoses and manifold

Posted on Mar 28, 2009

Molson02536
  • 3854 Answers

SOURCE: how to reset the service engine soon light

If there is an Auto Zone or any other large auto parts store, have them scan the truck for the DTC codes. The DTC codes will identify the Issues that needs to be addressed in your engine and transmission that has set off the service engine light on. Once the issues has been resolved, the light will reset it self after the third start up and after 40 start up will erase it self from the history as long as there is no additional issues. Good luck and hope this helps, Shift suddenly become very hard. When going from park to either reverse or drive it slams into gear. 1-2 and 2-3 shifts are also harsh. All gears seems to work. Problem may be intermittent: Check TPS for smooth electrical response. If the response is jumpy or erratic at all, replace TPS.

Posted on Nov 11, 2009

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