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I have an '06 and while I didn't run 4.2, I did run the 4.4 [beta]. I eventually had to switch back to regular tunes because it smoked too much, especially in the city around 45-50 mph and I stepped on it. Are you sure you had the software loaded right? Before I got my Goerend, I could slip the TC at will with 4.4.
 
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