Bettywhite

So first thing I changed spark plugs and then everything went wrong started misfiring on 4 and 6. That's the beginning 3 months nothing but problem after problem. Cat went bad replace the whole y pipe. Then lifter went on 6 pulled everything all new lifters and pushrods 4 new fuel injectors. Fixed okay now lifter went bad on 4 pulled everything replaced all lifter and push rods again got everything back together and now misfiring on 6. Afm is disabled but not deleted. What to do its been 2 or 3 times now within 3 months

So first thing I changed spark plugs and then everything went wrong started misfiring on 4 and 6. That's the beginning 3 months nothing but problem after problem. Cat went bad replace the whole y pipe. Then lifter went on 6 pulled everything all new lifters and pushrods 4 new fuel injectors. Fixed okay now lifter went bad on 4 pulled everything replaced all lifter and push rods again got everything back together and now misfiring on 6. Afm is disabled but not deleted. What to do its been 2 or 3 times now within 3 months