RPMs fluctuate when I turn it on and going up a small hill or just driving the truck******.

Tiny
RYANSTRIDER
  • MEMBER
  • 1993 GMC SIERRA
  • 230,000 MILES
The truck was fine I usually ride my motorcycle for main transportation then one day after not using my truck for 2 weeks I started it up. And the rpms and engine sound were fluctuating. Then I drove it and the truck****** violentely like it loses power then comes back on or the transmission is slipping. The fluids are good. I haven't done a tune up in sometime but it seems serious.
Monday, September 26th, 2011 AT 8:31 PM

1 Reply

Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
A tune-up wouldn't hurt anything. Any applicable trouble codes. Use a gage and check fuel pressure. If your saying, it doesn't idle well, clean the throttle body and idle air control.

I can't tell about your tranny?
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Monday, September 26th, 2011 AT 9:07 PM

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