When is the last time you changed your fuel filter? Also, I would look for boost and or vacuum leaks.
Idle Fluctuation
Sometimes at idle I am experiencing a 50-75rpm fluctuation. Doesn't do it a lot, but when I stop the truck and put it in park and let it idle for 10sec. and then it will fluctuate for 5sec. then smooth out. Running higher fuel pressure seems to help, and it will just randomly do it. Any ideas or is it nothing to worry about. /ubbthreads/images/graemlins/shrug.gif
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