1992 Buick Regal poor running

1992 BUICK REGAL
150,000 MILES • 6 CYL • FWD • AUTOMATIC
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NICKY42
  • MEMBER
  • 2 POSTS
3.8 liter has poor idle rough anything above idle engine runs smoothe after highway driving and coming to stop will some times die but easy to restart?have changed plug wires and plugs already
Feb 18, 2008 at 6:00 PM
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RASMATAZ
  • ✓Experienced Mechanic
  • 75,988 POSTS
Do you have a check engine light or has flashed before?

Check the idle air control valve/throttle position sensor and the exhaust gas recirculation valve EGR-

Might also want to check for an exhaust restriction to rule out the catalytic converter.
Feb 18, 2008 at 8:48 PM
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NICKY42
  • MEMBER
  • 2 POSTS
there has been no engine lights could i9t be the masair flow sensor? or egr valave? causing this?
Feb 19, 2008 at 12:23 AM
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