well then I would say you have an engine missfire or a very lean condition. I would remove the coil pack cover and make sure there is no oil in the spark plug wholes. I would then check, double check and triple check for vacuum leaks (cracked/broken hoses, improperly secured intake boots etc). The other thing to do is check the crank case vent valve. You can do this by starting the car and letting it idle. pull the engine oil dipstick and listen for a honking or howling sound, it will be noticeable. You will hear a sucking sound, that's normal. The other possibility is an intake gasket leak. How many miles are on the car??
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