1994 GMC C1500 truck runs ruff after warmed up

Tiny
DUCKHUNT2899
  • MEMBER
  • 1994 GMC C1500
  • V8
  • 4WD
  • AUTOMATIC
  • 172,000 MILES
This truck runs fine till it is warmed up then around 1500 rpms it will run rough but if u accelerate its runs fine. Also it will idle fine and if u give it gas right up to 2000 rpms or more its fine and goes back to idle fine but if u accelerate it easy to 1500 rpms it will run ruff and u let off it will almost die but never does and then back to smooth idle. Any ideas? Thanks
Sunday, November 23rd, 2008 AT 8:27 PM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,176 POSTS
Hi:
To me it sounds like a vacuum leak. However, before you start looking for that, I recommend having the computer scanned for trouble codes. Most nationally recognized parts stores will do it for free. Let me know if they find any codes and we'll go from there.

Joe
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Monday, December 15th, 2008 AT 4:28 PM

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