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Hesitation when accelerating unless putting pedal to the floor

Tiny
STEELMAN13326
  • MEMBER
  • 1994 GMC C1500
  • 199,000 MILES
Engine runs erratically wants to die while idling and loses power during acceleration if check engine light comes on truck runs fine.
Saturday, October 8th, 2011 AT 5:35 AM

3 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,709 POSTS
The idle could be a vacuum leak, bad idle air control valve. If the check engine light is on, have the computer scanned. Most parts stores will do it for free. It should identify trouble codes that will identify where the problem is coming from.
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Saturday, October 8th, 2011 AT 5:39 AM
Tiny
STEELMAN13326
  • MEMBER
  • 2 POSTS
The check engine light only comes on periodicly never when I want it to. Plus the truck runs fine when it is on it displays none of the symptoms that it has when it is off.
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Saturday, October 8th, 2011 AT 5:44 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,709 POSTS
Check the wiring harness to the PCM for a loose connection or damge to the plug. Keep in mind, even though the light is off, there could be a stored trouble code.
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Saturday, October 8th, 2011 AT 3:44 PM

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