recently i have seen several people post about a rough idle that goes away or gets worse at times. i have been dealing with this for over a month and finally got to the bottom of it, it turned out to be injectors that i just bought(new). cyl 6 stuck open, cyl 3 dribbling fuel, cyl 2 low pop pressure and then dribbling at times. cyl 2 and 3 inj tested fine sometimes and then others they would dribble or stick. hope this helps somebody avoid all i went through trying to figure this out.