Quote from joevette@gci.net on July 22, 2019, 8:11 pm

Cold  start engine starts and appears to runs fine.  IAC works it’s way down below 10. Once warm(200degrees ) on restart , Eng tries to  start and backfires thru exhaust violently . Fitech sent me two new injectors because I had fault codes on #4 # 7 injectors. Installed new injectors still backfires on warm start and injectors won’t clear. Help please.