86 Mustang Problems

I got an 86 Mustang V6 CFI

It has a few problems starting up, but when It does start up, I let it warm up and it idles around 2100 RPM, I know thats too high right? If it starts to drop and you don't hit the gas it kills. Sometimes when it drops it automatically(I guess) revs up a little to stay started, but that usually isn't enough. When I put the car in Drive, it takes off and kills. It seems to not be getting enough gas, even though the tank has gas in it. If you hold the pedal while in park, most of the time, it will stay started, or sometimes the RPM's drop to almost 0 and starts gagging and goes back up enough to stay started. I really thing the problem is in the fuel system, it doesn't have a visible leak. I was told that it could be Fuel Pressure Regluator, or the Fuel Filter, or the Computer. Anyone ever had problems like this before. Im having someone look at it tommorow, but I also wanted to get a few opinions also. I we can't get it running, I guess I have it towed to a shop.

it have an 86 LX 4-banger, with the carter 1 bbl carburetor. it does the same thing. it's either too little or too much fuel, i can't tell which. i know i got the timing about as close as it's gonna get. i have yet to get the choke settings and such right, however, so i'm not worried. no big deal. besides, i'm trying to get the thing running more out of curiosity and such than any practical means. if i get it running, that's all well and good. but, if not i'll just flatbed it out to my garage and take it apart.