MikeHuskey

Just to share my experience to hopefully help someone else, we have experienced the same issues with our 2008 suburban. For several days we have searched and read countless sites trying to find what was causing the rough idle, stabilitrak warning, and the hard shift from 1st to 2nd... After going by advance auto, O'Reilly's, and Auto Zone and having them hook up the code reader, we kept getting several codes. From oil pressure sensor warnings (which I replaced first) to a warning related to the stabilitrak needing serviced. But the code that turned out to be the fix to our issues was the multiple misfires on our number 7 spark plug. One of the guys at AutoZone suggested that it was most likely the coil pack that was the problem. With the vehicle running rougher and rougher I (not a mechanic by no means) swapped the ignition coil pack on #7 with #5 to see if the misfire code would then switch to #5 as well. Running rough I went back to two different stores to run the diagnostics and it was still showing up as the #7 misfiring. At that point the automotive angel nudged me to go ahead and buy a new spark plug. After an hour of trying to find my socket wrench and busting a knuckle getting the old spark plug out, I was a little shocked to see the old spark plug corroded and pretty ugly to look at. I got the new plug in and crossed my first fingers... And upon starting her up she ran like a top. No more warning lights... No more service the stabilitrak errors... And everything seems to be great. Not sure if this will fix everyone's problem, but after $7 for a new plug and a skinned knuckle the problem seems to be fixed. Hope this helps someone and good luck!

Just to share my experience to hopefully help someone else, we have experienced the same issues with our 2008 suburban. For several days we have searched and read countless sites trying to find what was causing the rough idle, stabilitrak warning, and the hard shift from 1st to 2nd... After going by advance auto, O'Reilly's, and Auto Zone and having them hook up the code reader, we kept getting several codes. From oil pressure sensor warnings (which I replaced first) to a warning related to the stabilitrak needing serviced. But the code that turned out to be the fix to our issues was the multiple misfires on our number 7 spark plug. One of the guys at AutoZone suggested that it was most likely the coil pack that was the problem. With the vehicle running rougher and rougher I (not a mechanic by no means) swapped the ignition coil pack on #7 with #5 to see if the misfire code would then switch to #5 as well. Running rough I went back to two different stores to run the diagnostics and it was still showing up as the #7 misfiring. At that point the automotive angel nudged me to go ahead and buy a new spark plug. After an hour of trying to find my socket wrench and busting a knuckle getting the old spark plug out, I was a little shocked to see the old spark plug corroded and pretty ugly to look at. I got the new plug in and crossed my first fingers... And upon starting her up she ran like a top. No more warning lights... No more service the stabilitrak errors... And everything seems to be great. Not sure if this will fix everyone's problem, but after $7 for a new plug and a skinned knuckle the problem seems to be fixed. Hope this helps someone and good luck!