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My 1992 Ford Aerostar has an extremely high idle while in park and neutral. When driving, it accelerates on it's own to about 35 mph. When I brake, it tries to lunge forward. This happened several times before and after driving at high speeds down the highway but always went away. Now after driving on the highway this weekend, it is still acting like it's going 60 mph at all times! Please help. I'm thinking about replacing the Throttle Position sensor. I cleaned the throttle body and that did not help. Thanks so much!

Answers from the Automotive Experts

Amanda J. Pierce, MBA Yes, I recommend taking a look at the Throttle position sensor TPS. Your description sounds like a characteristic of a failing TPS.

Amy Mattinat, Owner and Author at Auto Craftsmen Ltd If there is no check engine light on, it's most likely not the sensor. Best guess is its something wrong with the throttle cable. Whatever it turns out to be its not safe to be driving this vehicle. I recommend you tow it into a repair shop for a proper diagnoses and repair.

Barb Petrey, President - DBK Enterprises Inc at Jiffy Lube You should find a place with a diagnostic tool and have it analyzed.

Helaine Kurot, Owner/Technician at 360 Automotive Start with checking for a vacuum leak, possibly a line disconnected. I would get it checked out by a good auto tech as a car that wants to accelerate on its own is not a good thing.

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