I have the stock wheels and standard tires all at the same pressure. I think it only does it between first and second shift which from what I've read could be the mode selector switch on the trans. I'm going to clean it tonight and see if that helps. I also don't have any ABS light issues. If the mode selector fixes this issue I'll be stoaked and I'll let everyone know. It's for sale right now for $5900 but if I fix it i'll probably bring it up to 6k. Cause other than that there are no real issues at all, runs like a champ!