Engine troubles

[purple95stang]

I'm having a surge problem at startup. Sometimes when cranked the car idles fine at other times it will idle real low to the point that sometimes it just dies. It did this last night only it would start and then try to die but if I gave it gas it wouldn't take it and started making popping noises under the hood like a backfire. When I let off of the gas it would die. It kept doing this until I let it set there for about 10 minutes and then it started fine and ran fine. I need to have it looked at today but don't have a clue as to what it could be. I don't want a mechanic telling me I need everything under the sun that I don't really need. BTW it is a 95 GT with flowmasters and silencer removed.