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There are quite a few ways. 1. Sprinkle ice cold water into you carb/throttle body while the motor is running. 2. Seafoam, which can be bought at the parts store. 3. About every 3rd tank run a high octain fuel additive. 4. If your blowing smoke, add a quart of ATF to your oil and drive for about a 3 days, then replace the oil and oil filter. Do this for the next 3 oil changes and the smoke will be gone. Oil is a lube and coolant for the motor, it contains no detergents for cleaning. However ATF does and it will clean everything inside your motor. I have 200k miles on my 94 ZJ 5.2L and I don't blow any smoke.

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