1990 Pontiac Grand Am Idle miss

1990 PONTIAC GRAND AM
45,000 MILES • 4 CYL • FWD • AUTOMATIC
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HOWARD1000
  • MEMBER
  • 1 POST
when engine is at idle speed with air condition on engine has a bad miss, increase rpm to 1500 no miss, only engine miss when air is on , and when at idle. Thanks howard
May 30, 2010 at 10:25 AM
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RASMATAZ
  • ✓Experienced Mechanic
  • 75,988 POSTS
Hi Howard1000, Welcome to 2carpros and TY for the donation

Clean out the idle air control valve and test the throttle position and manifold absolute pressure. Also check the charging system alternator might be not be compensating for the AC load
May 30, 2010 at 12:19 PM
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