i have a 2003 dodge ram 1500 4.7l lonestar edistion, it has trouble starting as well as it dies after sitting at a stop sign or stop light for any length of time. dont know what it would be please help. i replaced the whole fuel pump assembly and it seemed to work until today.

 

Dirty throttle body, bad IAC, had it scanned for codes?

 

I just got it fixed last night at like 10, it was either the spark plugs cuz they had rust as well as it could have been the IAC, I replaced the IAC and it started up. I had no engine codes, check engine light wasn' even on.