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im haven the same problem have u fixxed it thanks in advance

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I missed this the first time around. If you mean the engine keeps on running a bit after the ignition is turned off I would recheck the timing and if that's OK get some of that stuff you dump through the intake that is designed to clean the carbon deposits from the combustion chamber. Sometimes carbon build up will create little hot spots that will ignite the fuel after the key is turned off. It's funny, I've had engines that would run for over a minute after being turned off. Not well but running. The gunk through the intake took care of that. You would run the engine hot then, at fast idle, dump the stuff through. Flood it out with the last in the can. Let it sit for the recommended time. Then start it up and watch the smoke pour out.

Wait till your tree hugger neighbors are out in their front yard. They just love that stuff.

The best way to clean carbon out of an engine is a squirt bottle full of water. Have the engine running at about 1500-2000 rpm and squirt the water down the carb, but do NOT let it die. The water turns to steam in the cylinder and cleans the carbon out extremely well. I've done this to a lot of different engines and you should see the amount of black crap coming out of the tailpipe! Oh yeah, do it out in the street if you can so you don't have to clean up the mess it makes!

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Good point. I have used water as well but thought the stuff in the cans did a better job. Maybe I was just fooling myself. The snake oil salesman comes to mind here.

a little bit of dex merc III auto tranny fluid down the carb works great too. nice thick smoke with a real liquid like carbon deposit discharge. but like turbo said do it out close to the road. that crap will never come off a concrete driveway.