I'd find out if you have the early PES tune or the later PES tune, or get someone to do custom tuning for you. You can search for it, but I think the basics are, PES started their G3 kit with a GIAC tune. It wasn't great, but did the job. I've read that it ran a little rich at the top end, but otherwise wasn't bad. There was some sort of falling out between PES and GIAC, and they started selling the kits with their own tune. It switched things around at the top end and rather than being rich, it ran lean, too lean. That is how motors went bad AFAIK. There shouldn't be any problem driving with it in 'S', just be mindful of your RPMs and you should be fine.
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