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Message: [QUOTE="kickinupmud, post: 687458, member: 11237"] my buddy brought over his $6000 dollar MacTools Scanner, it pulled P1275- cylinder 5 High to Low side open P0603 P1316 it also brought up, Cylinder 3 & 8 contribution or balance malfuction what does this mean^^^^^?? what do the codes mean and what can cause it the reason i had him scan my truck was becuase i was headed off base and had to go up the pass which is pretty steep, i was 5th gear (manuel Trans) running a steady 2000rpm's. when suddenly the truck jerked hard, i noticed the rpm's dropped down between 1500-1750. i was easy on the throttle till i got to the top, then it ran fine. then a few days later i was on the interstate 5 gear, 2000rpm's. my buddy came up beside me in his duramax, and of coarse we both floored it, i was running 2300-2500rpm's for about 3-5min. then out of no where the truck did the violent jerk 6 times in a row, the rpm's would drop 250rpm's every time it did it. What could cause this. Ive noticed that the check engine light comes on when i lay the pedal to the floor, no matter what gear im in. my buddy said it could be a fuel pump issue. What Do you guys think? ive just recently got the truck, never owned a diesel before but have been around cummins and duramaxs my whole life truck info: 2001 f250, 7.3 powerstroke, 6 speed manuel, K&N air filter, Banks Chip that plugs into the CPU (Removed since problems started) Recent fixes: changed oil, changed fuel filter, changed the TPS and CPS [/QUOTE]

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