I was driving home last night on a rebuilt motor with just over like 3000 miles on it i was rompin on it a little and i was driving down i5 bout 15 miles nothing was wrong no big deal i get off the freeway start driving on main street i hear this loud *** banging noises im thinkin its maybe my exhaust because it doesnt make the noise all the time but im not so sure now when i accelerate it doesnt ping but when i am idle it doesnt ping its only bout half throttle anywhere on the tach.... any help would be fantastic!