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1998 Chevy Lumina

Tiny
BIGBOSS0813
  • MEMBER
  • 1998 CHEVROLET LUMINA
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 135,000 MILES
When I'm driving for a while at around 55to 65mph and I go either uphill or downhill, the car will start to buck and i'll give it gas and it will go away. I think it might be the exhaust that I put on that it doesn't have enough back pressure when traveling at that speed or it might be the torque converter going. The car runs great under 50mph, I had a tune-up on the car changed all fluids had all new filters installed. I'm not sure what to do now to fix this, Please help.
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Tuesday, April 20th, 2010 AT 11:12 AM

3 Replies

Tiny
MHPAUTOS
  • MECHANIC
  • 31,938 POSTS
Ho there,

Thank you for the donation,

This may be a coil or plug?Lead breaking down under load, have you investigated this as yet.

Mark (mhpautos)
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Tuesday, April 20th, 2010 AT 9:53 PM
Tiny
BIGBOSS0813
  • MEMBER
  • 2 POSTS
I don't even know where thoses are where would they be located? I don't have the tools for a big job, is this a job that I should bring to a mechanic?
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Wednesday, April 21st, 2010 AT 6:22 PM
Tiny
MHPAUTOS
  • MECHANIC
  • 31,938 POSTS
Hi there,

I feel that you best leave this to a mechanic, what I have suggested is the basics, but there may be further investigations require that will need some expensive diagnostic equipment.

Mark (mhpautos)
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Thursday, April 22nd, 2010 AT 9:23 PM

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