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Originally Posted by GTP Dad
The MAP sensor is a place to start. However, I never recommend removing cats just because in most places it is illegal to do so. The cat is probably internally damaged and needs to be replaced. If you heard a rattle don't worry about testing it further because the rattle tells that the medium has broken up. It is possible that it is blocking the exhaust and that is why you have a loss of power. Removing the cat and putting a high flow unit on will help remove the exhaust from the car better and should improve the performance issue. You can buy a universal cat that will work for less than $70 from a variety of places. Get it welded into place and try it, I believe your problems will go away.
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Thanks for the recommendations.
I saw on the LeSabre page that a broken motor mount may yield a "shudder" symptom. Any possibility on this one? How does one check a motor mount?