What do I need to do or what could be the problem? on 2004 Nissan Altima

okay got car back to running good. however my service engine soon light still comes on, I've replaced an alternator on my car, light went out but came back on after another two days. Also, in the morning or after my car has sat for 4 or 5 hours when I put the car in drive it stalls then go but will go into reverse for a while even if just starting. If I let the car run for a while it goes into drive with ease.

Asked by for the 2004 Nissan Altima
1 answer 2 comments
what are the codes in ecm?
what is ecm? Sorry don't know much about cars.
go to auto zone and ask them to scan your codes,its a free sevrice. then post for us