4.6L (1996-2004 Modular) Mustang Technical discussions on 1996-2004 4.6 Liter Modular Motors (2V and 4V) within.

rough idle

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Old 12-23-2008, 09:36 AM
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1999 GT
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Question rough idle

my car has been sitting in the garage for a couple of days, and i went to start it yesterday and it was idling rough and shaking...but after a few seconds it was fine...it seems fine now but it was shaking abnormally and it hasn't happened before. after i shut the car off the garage smelled like gas/unburnt fuel mixed with exhaust fumes. its probably from sitting but what do you guys think
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Old 12-23-2008, 07:18 PM
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How long has it been since your last tune up?
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Old 12-23-2008, 07:24 PM
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the car was serviced in may with 39k on it....it only has 40k on it now
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Old 12-24-2008, 03:11 AM
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whiterabit998
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mmmm if you have a coolent leak it might of leaked some into the cylinders and then burned it away..

but then again if u smelt bad exhaust then it was miss firing for a little
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Old 12-26-2008, 03:18 AM
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What kind of gas are you putting in? Try putting in a higher octane if you are not using the highest and of course drive the crap out of it.
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