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  1. johnnyjet
    12-27-2008 01:29 PM - permalink
    I have a stock 04 gt, 60k miles,put gas in hte other day and parked the car -when I restarted check engine light came on. Car began a tiny roughness at Idle. Idle rpm rought at 700, smooth at 1000. But varies idle speed from smooth t rough. I suspected fuel cont or grade, add 6 gallons premium and stp fuel treatment-
    drove about 20 miles varing speed and rpm high to low, still sough idle persists and comes and goes.I'm in tennessee and the weather is wet and cold-have had ice on car at night a few times-could it be ice cracked a vaccum line or gas cap problem-
    Car runs perfectly over idle-cruise-full throttle-etc. So far. Or should I add more fuel -top tank for possible bad fuel octane ?


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  • Last Activity: 12-27-2008 01:30 PM
  • Join Date: 12-27-2008

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