1996 Chevy Camaro Car dies

Here is what is happening. After driving about 20 minutes the throttle acts like it is sticking at 1500 rpms for a second, and when I try to apply throttle it doesnt effect it. Then the car will kind of diesel a little bit and die. I will turn it over and start it, and sometimes when I am lucky it will drive off like normal but it takes a few times before that works. Most of the time I start it, it idles, and when I put it in drive it diesels and dies. After it gets warmed up it tends to die at red lights pretty often as well. Also the temperature gauge is working intermittently. Any clue? I have new plugs, wires, fuel and air filter. Also the oil pressure goes low when at idle and jumps up during acceleration.