[Johnny Mullet]

One more note.

I do not use fuel additives, but I do use Seafoam. I buy a can and dump 1/3 in the motor oil when there is about 500 miles to go for service, another 1/3 into the fuel tank, and the last portion gets sucked right down the throttle body while the engine is running and my hand is on the throttle to keep it from stalling. After you get it all into the TB, shut off the engine and wait 5 minutes. Then go on a drive and watch the smoke! It may be very severe at first, but eventually clears out.

There is an old trick they use on the Crown Vic police interceptors where they spray water into a hot engine through the throttle body. Carbon cystalized in the combustion chamber will actually shatter when the water hits it and it breaks up and is expelled out the exhaust. I have done the water trick before, but I prefer the Seafoam since it offers lubricity and will not harm the engine in any way.