I asked my friend who is a mechanic he said the rough idle was caused by the mixture of oil and coolant that enter the spark plug chamber. When I pressed on the accelerator the rough rpm goes away. I hope its just the head gasket.

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94 E320 Silver 210000 miles
94 740il Pewter Green 97000 miles- Retired
05 S430 4Matic
07 Lexus IS250