I have been dealing with a throttle hanging issue that myself and several of my tuner friends could not find the cause or solution to on an LT4 crate controller. I finally got some answers directly from GM. Apparently since I purchased my LT4 crate harness and ECM, there have been changes. At the time there was only one part number. Now there are two part numbers, one for auto and one for manual. GM will only tell me that the harness is different and they claim that I cannot plug in a manual E92 ECM into my current harness. I am looking to see if anyone has a stock crate LT4 manual cal that they would be willing to share with me so I can just give that a shot before I try to get GM to correct the problem with new hardware. Thanks!