Whether he cheated or not, he's an idiot.
That is a prime example of why you "sell" your prized car to a buddy before you begin any divorce proceedings. If it's not there, and you don't own it anymore she can't damage it or take it in the divorce, and you can get it back from your friend when everything is said and done.
I've watched 2 friends go through a divorce and both of them had nice rides. One still drives his modded 03 Cobra, and the other ended up with a beater Aspire.
Gotta think ahead and CYA.
Jay
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These are highly engineered precision vehicles, the first step in diagnosing the problem is to strike the suspected offending part sharply and repeatedly with a blunt object, then re-test.