Car mechanic has been fixing my car for over two months?

Update: One of the repairs was the timing belt which he suggested be changed. It's a Lexus IS300. Once he finished the engine started to misfire. First he said there was a bad tensioner that came with the timing belt kit. Once he got a new tensioner and replaced the bad one he said that the valves weren't seating... show more One of the repairs was the timing belt which he suggested be changed. It's a Lexus IS300. Once he finished the engine started to misfire. First he said there was a bad tensioner that came with the timing belt kit. Once he got a new tensioner and replaced the bad one he said that the valves weren't seating right and replaced four of them and now is telling me the seat broke on the first valve/cylinder. Every time we talk he says he should have it all done by tomorrow...
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