2001 Mazda Tribute Repair Question
What would cause a muffler rattle, car shake while driving, and engine "mis-fire" at higher speeds?
Muffler rattle could be a loose heat shield. Car shake is most likely a tire/wheel out of balance. Misfire could be bad plug or wire, or a weak valve spring. Check engine compression.
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Get under the car and thump the muffler, if it rattles you will have a collapsed baffle or internal pipe, this may also cause a back pressure in excess of normal allowances causing the tune problem as well.
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