Also, it needs to match the PCM. The code is different and likely if it doesn't match the PCM it will load it into an area of memory in the PCM the computer will not like.
I had the same problem with a ts chip. It worked fine except on the highest setting it would sputter and hardly run. It worked great on all the other 5 settings. I sent it back to be reburned and that fixed my problem.
my truck lopes almost as bad as my drag truck with a .649 lift solid cam when its on the highest setting at idle but if your on the skinny pedal it just screams like a raped ape ...lol
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