what seams to be your problem, your title seems a bit cut off!

Answered by blackop555 (expert)
10,902 answers provided

Sorry about that. The engine begins to sound like a diesel engine after it warms up (slight shaking). Can a dirty pcv valve cause this. Someone said it is sensors, but engine test lights test okay. We changed fuel pump, injectors, plugs, fuel lines, cleaned fuel tank, etc., did not fix. Forgot to check gap on plugs; could this cause it?

Response from pija
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