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944S Idle Fluctuating

  • 1987
  • 944S
143 000
Colorado Springs , 

Every once in a a while if I have the Air condition running when I stop at a red light the idle goes way below 900 rpm and feels very rough- almost dies if I rev it up and it will go away... Usually only happens after driving on the interstate for a long period of time at a high rate of speed... this never happens when I'm not running the A/C... 

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