david5292

I have a 2002 GMC sierra 1500, V6 4.3L. I am having an issue with the RPMs slightly fluctuating when accelerating. It does not seem to do it all the time. Or eventually it will go away for a while and come back when driving for a while. The RPMs generally only jump up an down less than 100 RPM or so (it moves very little). You can actually feel the trucks RPM changing so not a gauge issue. I don't think it fluctuates when idle (at least I don't see it), mostly just during acceleration, when speeding up its hard to notice, its usually when you are driving steady. I tend to mostly see it in 3rd gear, but I believe it does it in every gear, just not as noticeable. Transmission also seems to shift fine. There are is no check engine light, and no codes. Recently had a tuneup done, new plugs and wires, so no misfiring. Replaced both catalytic converters. I will be installing a new fuel filter soon, so may see if that does anything. Things I suspect may be issue: Fuel filter - will replace soon Throttle body/Sensor - will try to clean it and test the sensor for resistance MAF Sensor - will try to clean it Transmission/Converter Exhaust leak - haven't checked yet Any ideas what could be wrong?