IS 2010 with 91K on the dash. When I shift from Park to Reverse. The RPM JUMP between 1 and 3. It wont stay, just jumps. When i hit the gas I don't feel any issue going Reverse. But if I sit there in Reverse I can feel the car jerking a bit. I have used Seafoam in the past prior to a Oil change. Tryed putting in Shell Premium fuel as I hear it helps with Carbon Build up issue. Dealer can do a Top Head Engine clean for like 800.00. I wish I could get it Wal-nut blasted but I dont know anyone that can do it in Florida. Would you stick it out? OR trade up when season comes in to do so. (maybe 2015 IS model)