Sorry somebody had commented regarding my issue with the high idle on the ECU forward Sierra cusworth level 8 ECU. Someone is saying that the positioning shuttle sensor is different on a two-wheel drive four-wheel drive level 6 and level 8. When I lock it up it's telling me that the truffle position and sensor tf09 is the same for all the sierra's and someone provided me with a different number that I can check but I can't seem to find any other one other than that