My 03 GTP has sputtering issues at WOT over 4000 rpm and the SES light only stays on and blinking while I'm at WOT; hence not enough time to go to Auto Zone and get the code read. Plugs are a month old and I just replaced the the wires and coil packs. Air filter and MAF are next but it would be great to get the code read to help track down this problem, thanks.