ill try to define - somewhere in the range a noisy lawnmover makes, or a noisy old vw bug. Basically it sounded rough - particularly the more gas and rpms the louder it sounded - when the engine was cold.

the mechanic is reputable. He works on everything.

how would i go about resetting the ecu? i tried pulling the back-up/ radio 7.5 fuse for ten seconds - the chilton said this resets the pcm (powertrain module) - it that the same thing?