Mechanics

ON A , CAR SLOWS DOWN TO IDLE, THEN IT WILL RUN GOOD FOR AWHILE THEN DO THE SAME THING AGAIN

1999 Mercury Marquis • 12,000 miles

I had 2 snow tires put on the rear wheels, and when I was on my way home, the car would get up to about 50 mph, and slow down to about 20 mph, then it would run good again. Is this caused by the speed sensors? It does this off and on. Can you tell me what and how to fix this problem? Don
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Don Jackson
January 2, 2012.



It might be due to speed sensors. Were the snow tires you put on exactly the same size?

Rivermikerat
Jan 2, 2012.