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Engine Hesitation

Engine

Vehicle Information: Model: 911 Carrera Slantnose; Year: 1986; Body Type: Targa; Engine (type, size, modifications): 3.2; Total Mileage: 110,000;

I have a bizarre situation whereby as the car gets dirtier, the engine wants to hesitate/buck. I can be driving on the freeway and all of a sudden the engine loses power as if I took my foot off the accelerator and then put it on again. Or, I can be driving in 1st or second, hit a bump, and then the car hesitates/bucks. The kicker is that when the car is washed, it runs great for about a week and then starts acting up again. Is there something that runs under the vents on the top of the front fenders or under the black grill on top of the engine compartment that when cleaned would make the engine run better?

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