Any thoughts other than a possible bad ecm? This is what i know.... I have went through 3 transmissions in the past 20,000mi, when u lift off the throttle the engine comes to idle in 3 and 4 and i believe this has led to the transmission failures. I have talked to several people about this problem but no one can give me an answer on what could b causing the issue. I have not tried driving it with out the ts switch installed but i dont think that it is the cause of my problem. Other than a bad harness (witch i did a continuity test on to rule that out) the only thing i can think that would be left is the ecm itself. The problem is, they are a littlle expensive to b replacing on just a guess.