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What causes a jerk like a missfire at high speed
2002 Mercury Mountaineer

What causes a jerk like a missfire at high speed

(2002 Mercury Mountaineer)
We have a 2002 Mercury Mountaineer, It has 104,000 miles on it. We just had a complete tune up done on it. Wires, plugs, gas filter, etc. At no certain time, it will jerk like a miss fire. Usually when cruising down the highway. What could be doing this. Motor or transmission?
What seems to make the problem better or worse? its periodically jerking no certain time or speed, usually when just cruising down the road.
How long have you had this problem? noticed it after tune up. but I can't be sure
Tags: mercury, mountaineer
1 answer & 0 comments
Popular Answer
on February 14, 2019

Strongly suspect it is indeed an engine misfire .. This vehicle has an ignition coil on top of each spark plug - one of those ignition coils is failing at cruising speed.

Regardless of the so called “tune up” - - the engine IS experiencing a misfire!!
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on February 14, 2019

Strongly suspect it is indeed an engine misfire .. This vehicle has an ignition coil on top of each spark plug - one of those ignition coils is failing at cruising speed.

Regardless of the so called “tune up” - - the engine IS experiencing a misfire!!
Sign in to reply

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