engine runs rough

98torch · February 4, 2005

i got off early today and decided to change my oil. everything ran fine but i went to the automatic car wash cause i didn't have time to detail my truck and when i left the engine started to stutter between 8 and about 1500 rpm but it only did it in drive, butnot park or neutral.

PeterbiltChrome · February 4, 2005

Do you mean the engine actually stuttered under the low acceleration? If so, that makes my story pretty irrelevant.

My dad's 98 pickup (5.7 vortec) did that after about a year, mostly when the a/c was on, idling in drive sitting still. The RPMs would bob up and down. I believe they flashed the computer with some new software because it was a computer screw-up. I think the comp was misinterpreting feedback from the transmission pressure and compensating with throttle. It didn't stutter, just bobbed up and down.