Guys help me please. My 97 Tahoe was working great then all of a sudden it started popping while in nuetral or driving. Sounds like its a misfire or something. Put in a new timing chain cause it was bad. Cat convertors are new. Could it be the fuel filter? Bad O2 sensors? Only codes that come up are misfire and crankshaft to camshaft postion sensor I think. HELP ME HERE. Plugs and wires are new. So is dist cap. But its been about a year since I did those.