hey scott i have a 09 mazda cx 7 that had codes for a crank/ camshaft position sensor and i took it in to the dealer for recalls and they said i need to change my timing chain .... but i was driving it and it kept stopping on me ... i took it to a mechanic and he changed one sensor ... but it kept stopping on me ... now the mechanic says i need a new engine i... was wondering if this sounds right and if so how would i go about finding some one that can do it properly and if its worth it (if this car is known for alot of engine related problems)

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already answered this elsewhere, but if the first guy was right, then odds are it broke down further and now the engine has been seriously damaged inside. SO have another guy check it if you don't trust the last mechanic, but odds are he is right