Any one have this problem while reversing my 04 tblz 4.2 the idle will go up & down to where it almost dies out this is at a low rpm like backing into a parking stall or garage. Well yesterday it died out completely 2 times while trying to get out of a parked stall. i have an appointment with my dealer, they said they had a tblzr in last week with similar symptoms but could not replicate the stall. So i guess when it dies i am imaginig it. Any suggestions.