please help. car is a 87 Z T-II. starts fine. idles fine. but starts to miss fire around 6 to 7 PSI of boost. drove car home and found code 15 and 22(just set base timing to 12 btdc) does the speed sensor effect timing under load? i also checked all my new silicone vacuum lines and everything looks good and going to the right places. I also reset the AIS because i added a stock roller cam and roller followers. car has a MP stage II LM for 14 PSI WOT. and a stock T-II turbo just rebuilt by TU. any ideas on whats going on?