420 surges while coasting downhill....HELP!
Hoping someone can help me with this problem: (1986 420sel)while coasting downhill at any speed I am experiencing a decelerating surge...feels like someone is pressing the brake pedal on and off. One other thing that is occuring that may be related is a decrease in fuel economy....gone from 20 mpg to 13 mpg?
Any ideas...help?
gb*kw
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