I have been working on getting everything sorted out with my Spirit R/T. It has +20% injectors and a FWD Performance Stage 1 ECU. The ECU has been programed for the bigger injectors. I checked my fule pressure and it was 47psi with the vac. line, and 57 psi with out. I changed the FPR, but can't check the pressure. The guage is at my bothers house right now. I changed the MAP sensor because the computer had code 13 showing. I have also replaced the O2 sensor. I don't know what else to check. I have a OTC 2000 scanner, and pathfinder II cartrage. I don't have a book for it. I don't know what else to look at or test. Can anybody point me in the right direction?