Engine Mechanical problem
1997 GMC Yukon V8 Four Wheel Drive Automatic 138000 miles
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Hello there I just want to know what could be causing the light vibrations in my engine? I just bought it like 3 weeks ago with no problems, no oil leaking, great power, ran great,no over heating ect everything was working fine until 08-26-08, In the morning I felt the little vibration but still ran good,then later in the day the service engine light came on and everytime I slowed down the I felt the vibrations a little more,but then later on the day my girlfriend noticed like a gas smell or something,well anyways when I was at a stop light and I press on the gas pedle a little white smoke came out but dessapeard when I speed up,I noticed the smoke a little more when I stop then go, but all of sudden I didnt see no more white smoke but still felt the vibrations, with no overheating at all, what could it be? could be something serious? do u recommend I still drive it? please help

you can drive it, wouldnt go to far and i would cary a cell phone.

get the vehicle scanned for codes since hte light is on. it will help narrow down the problem. post it back!