When i go to start my car after it's been sitting for 3-5 hours or more, it just won't fire. after i crank it for anywhere from 20-45 minuets, it fires up, but i have to let it run idle for a bit before i press on the gas at all or it will stall. after that, it runs and drives fine, and as long as it's warm (not sitting for more than 3-5 hours), it'll start rite back up. i've had people tell me it was the fuel pump, and i replaced it. had a tune up done 6 months ago. Battery and alternator are good, air filter good, and i run lucas fuel system/injector cleaner every 2 weeks when i fill up. I'm baffeled as to what it could be, or as to what i can do to get it started for now, untill i can get it fixed by a pro. Please HELP!! Thank you for your time! I look forward to hear your diagnosis.