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Performance gets worse as engine gets warm

Tiny
Z1019
  • MEMBER
  • 1995 OLDSMOBILE AURORA
  • V8
  • AUTOMATIC
When I first start my car, it does just fine. As it warms up, performance gets worse. Terrible acceleration, very rough idle, and my mpg is around 10. Also have a bit of a clunk/pop that develops when its warm, sounds like a
tennis ball in a metal shoebox. So far, I've replaced the cat converter (which was bad, but didnt fix the problems). New plugs and wires are next on the list, but I was just wondering if anyone may have any suggestions as to what else I should check out.
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Sunday, January 23rd, 2011 AT 4:17 PM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,758 POSTS
If the check engine light comes on, have the computer scanned. Most parts stores will do it for free. Ceck fuel pump pressure. Check it for a tune up. Check for vacuum leaks.
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Monday, April 4th, 2011 AT 3:18 PM

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