I have a 2004 Pontiac Rally since new and have never had a real issue until now.All of a sudden I have trouble starting.I turn they key and it starts but idles off and if I give it gas nothing happens.This has happened numerous times but ended up starting after 20-45 minutes of waiting.The tek runs fine at low and high speed.It just seems to be very random.Today it stalled in traffic and wouldn't start until over an hour later but ran excellent afterward.If it was fuel pump or filter wouldn't I have more problems than just a starting issue every few weeks?