Time to find a new mechanic IMHO. Shouldn't take more than 30 seconds to adjust throttle, and 75 -100 is way over exaggerated. Besides the only time you might notice any difference is at WOT. Hope he did this for free......
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Jack
Zoera-sc7xxx - You don't think that this is dissin the mechanic? It is a public forum but I don't recall Sandy asking for anyones advice? It was a retorical question about whether or not he should do it.(assuming you know the meaning of the word retorical)
If you think it takes 30 seconds to adjust the throttle of a fuel injected computer controlled $40000 motor, it tells me a lot about your mechanical ability. Not to mention that Roush fuel injection systems are proprietiry and any hack with a laptop aren't able to adjust them, it takes experience, skill and permission from Roush before you are even access the software.
Ron