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1997 GMC Safari Rough running

Tiny
JOHNSON VIKING
  • MEMBER
  • 1997 GMC SAFARI
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 240,000 MILES
My safari seems to missfire.
This occures while cruising only. That is while doing about 65 MPH on the highway. It seems to accelerate fine and is ok when I let off the gas.

It seems to get worse in colder weather.

The problem is getting slowly worse.

Thanks
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Thursday, December 11th, 2008 AT 8:58 AM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Do you have a check engine light and when was the last tune-up?

Misfires can be caused by worn or fouled spark plugs, a weak spark (weak coil, bad spark plug wire), loss of compression, vacuum leaks, anything that causes an unusually lean fuel mixture (lean misfire), an EGR valve that is stuck open, dirty fuel injectors, low fuel pressure, or even bad fuel.
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Thursday, December 11th, 2008 AT 9:20 AM

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