Car backfires when cruising in 2nd gear at 1700 rpm and when I'm park at 1700 rpm. Was rich and rough at idle but changed maf and o2 sensor and now she idles fine. All numbers on scanmaster are in range except blm was 102, tps was .57 at idle, and volts was 12. Got a 200 amp alternator. Haven't installed because I have a slight coolant leak from water pump so I want to replace that while alt is out. I have a TA33 turbo, 42 lb injectors. 86/87 ecm, ls1 maf, translated, extender chip, adjustable wastegate, fuel pressure regulator, and 340 fuel pump. Looking to be pointed in right direction! Thanks!