1995 Pontiac Grand Am Engine vibration

1995 PONTIAC GRAND AM
195,000 MILES • 6 CYL • FWD • AUTOMATIC
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REVSHAWN
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  • 1 POST
The car has a vibration when I get to speed on the freeway and try to hold it at that speed. Even when I set cruise control. It also has rough idle. Things I have replaced are: fuel pump, fuel relay, fuel pressure regulator valve, plugs and wires. I have no idea why it is shaking only when trying to maintain speed, not while speeding up or slowing down.
Mar 27, 2009 at 1:24 AM
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MMPRINCE4000
  • ✓ASE Certified Mechanic
  • 8,548 POSTS
  • ASE Certified Mechanic
A bad alignment can cause a vibration, from mild to severe. Also check motor mounts.

Remove and clean the IAC (idle air control valve) also remove and clean the EGR valve, pintle and base.
Mar 27, 2009 at 7:38 AM
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