Posted to GM Driveability on 3/9/2007 13 Replies

this sub has a mis fire on #7 cyl at idle if rpms raised to 1500 miss is gone.I have looked at the plug wire and coil swapped to different cyl.swapped injector checked fuel rail for obstruction.checked compression.smoked tested for vacumn leaks none found.pull...

FIX posted 3/15/2007