When i start the car it runs fine for a minute or so and then it runs very rough. Sounds like there's huge cam in the car. I can hear a huge volume of air being sucked threw the throtle body. It will do this as long as it's at idle. as soon as i drive the car for like 30 seconds it all clears up and runs like a top. I have replaced the injectors and fuel pressure regulator.the car has a new O2 sensor, tps,iac,timing are all adjusted correctly. i'm at a loss, any ideas???btw it's a 90 formula 350