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Hey Vode, couple of things for a trans tune in this thing:
First you need shift points aligned. Look at shift speed, part throttle shift and WOT shift. You want the 100% column to match the WOT...

And I hate to say it too man, but a friend of mine took his Grand Prix to a 3800 tuner and within a year, two trannies and an engine later he finally let me have a go at it. What a mess it was, I was...

If its dying at highway speeds its either a bad MAF or crank sensor or both. Bugger of it is they wont throw a dam code for it for some reason. You have to have been down this path, pulling out your...

Jerry has the same results Id expect. I would have that car at 18* WOT, 11.6AFR and 42*-44* cruising. I also agree with a 180* stat. I've seen guys get them to 20-22* tuning. But have always wondered...