Fuel Screw

[adamdrives]

Hey peeps, having some difficulties turning up the fueling in my 85 d24t. I've bottomed out the screw on the collar, and adjusted the idle screw so it's about where it should be when idling. The problem is, when I start the car cold, the engine wants to rev really high, like to 3 or 4 thousand rpm, which is as you can imagine alarming and probably not good for the motor. I'm not very familiar with the pump design, but it looked to me that the cold start device is linked to the throttle linkage. I haven't seen this problem mentioned in the peformance sticky. Am I missing something? I've turned down the fuel so that it now stays at about 1500 until it's warm, but I'd like to be able to turn it up more. Maybe a problem with my cold start device?