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 07-26-2007, 04:42 PM
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mustang02racing
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Default rough idle

Ijust took apart my motor and put it bac together. i replaced all the gaskets (head, timing cover, etc) and now when i start the motor it wont start without me holding down the gas half way and the car is idleing rough any one have any ideas???? thank
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Old 07-26-2007, 05:21 PM
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Pest007
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Default RE: rough idle

Sounds like a spark or fuel issue, only 3 things needed for an engine to run, fuel, air, and spark. I'd say just check your plugs, maybe connector got loose on either a plug or injector.....
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Old 07-27-2007, 09:25 PM
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03greyGT
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Default RE: rough idle

you also may have a vaccum leak. Try and spray starter fluid around your intake gaskets as well as the plenum gasket. If the idle kicks up you have a leak...
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