Quote Originally Posted by scottydoggs View Post
rotted res or muffler can make a backfire sound too. mine was. you dont say year or miles, but thats a possibility.

if you can get the car in the air, ramps or stands, let the car cool off. when cold, start it and get under it, with your hands keep them a few inches from the pipes, if theres a leak still you should feel it. also look for areas that are black with carbon. do this to the res, all the pipes and the mufflers.

then you can also have some one rev the engine while your under it listening for the popping sound.
It is a. 2000 with 153k on it

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