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bank 1 running really lean 2001 ford explorer 5.0 Back story, had bad valves on #5 so took both heads off to get rebuilt. Now bank 1 is running really lean. Short term fuel trim is 42% and its back firing etc. Bank 2 is completely normal. When I add propane it will drop bank1 to about...

New to me 2001 ford explorer limited 5.0. Previous owner just replaced plugs,wires. I got it cheap nowing it had a misfire. Now I cant find the source. I replaced #5 fuel injector which didnt pass the resistance test. I still have a miss fire though. You notice it worst in gear at idle...