Q: Engine noise

asked by on February 05, 2017

.but to keep it simple,its a 2004 mustang v6 3.9 automatic, Engine noise with new belt old belt on or off.it has new idler pulley,tensioner,alternator. Can it be the harmonic balancer or something else? Ive had two misfires also.

My car has 125000 miles.
My car has an automatic transmission.

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