99 tahoe. I have a sputtering issue that just won't quit. I've changed my fuel pump. FPR. Cat's cut. Mass Air Flow. Intake Air Temp. sensor. new plugs. Now, it won't even run. It will turn over. getting fire. getting fuel. Almost sounds like it's out of time when I turn it over. It does have 150K= on it but the chain shouldn't have that much slack it would it? It's turning into a guessing nightmare. I did run a scan on it about three weeks ago and cleared all codes out to try and pin oint it and it ran fine. For about a week, then it starting sputtering again. It only does this for the first 10 to 15 minutes of driving then it's fine. Please help...Thanks.