03 suburban mult cylinder misfire???

[770johnnyw]

guys ive tried everything...intake gaskets plugs wires the whole nine. shakes bad at idle and clears up somewhat while reving. i did notice when you unplug the white connector on the driver side the truck shuts down and unplugging the pass side will just cause it to run rougher. any ideas

[Chuck L.]

Maybe a bit late... Do a data log and post it up....
Sounds like there's 1 or more "issues" on the pass side, and the dr side is ok. When u unplug the pass plug only the remaining "good" cyls drop out. Engine is now on 4 cyls...
While on the dr side, you kill all 4, +the pass dead players, and the engine dies.