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I was just wondering if anyone with a 4x4 had any problems when they tuned there pcm and are they happy with it. I am looking at tuning but am worried about side affects of it.
 

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what did you notice after tuning?
 

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I had mine done 3.5 4x4. by THE MAN Gerry . it runs better and the gas mileage is the same. Best thing I've done . oh it's an 04 Colorado reg cab.
 
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