I don't think this is a normal problem ,this is gonna be long but please read and help , after lots of electrical test part swapping and replacing I am still running rich . as of now I am not using the pms it is on the bench stock computer only (a9p) , 36 # injectors replaced with 30# , correct calibration tube being used, maf properly cleaned , spark plugs are autolite 3924 gapped at .054 , base idle correct and tps at .99 , timing 14 degrees,o2 sensors replaced, o2 sensor harness completely continuity checked, all grounds checked and good , maf,map,and tps sensor checked and good . after all that I am pulling (code 91 only) and it just wont go away , ive cleared codes in ever fashion including battery disconnect to clear kam redrove reran test and 91 just wont go away , car starts and runs ok but is runnin rich enough the smell bothers u at idle , heres the kicker after parts replacement injectors , computer, plugs, and bypass pms ,the car ran so perfect I couldn't believe it !! but only lasted for that one run the next time I cranked 2 days later it was right back to runnin rich , please please help I am at total lost at this point , thanku in advance