I have a 1986 Mercury Grand Marquis. V8 5.0L with 56k miles automatic tranny. When driving or idling it stutters, if I pour on the throttle it does not stutter, it only shows these symptoms when at cruising speed whther it is 70 mph or 30 mph and never when excelerating?
Optional Information: 1986 Mercury Marquis V8 5.0L
Already Tried: Nothing
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