i have a 99' GTP with 168K miles on it. heres my problem the trans wint shift into OD unless i get the RPMs over 3000 and i let off the gas a little bit. If im slowly accelerating at like 2100-2500 RPMs it wont its weird because like 3 weeks ago it shifted fine. i was wondering if its a problem with the performance shift or something? or maybe something else?