I'll try and make this as clear as possible as it's on behalf of someone else. 
No throttle response after start-up when car has been left heat soaking, it does come good after a little fiddling or holding the pedal down before start-up.
Another thing that cures it is unplugging the IAT sensor but is the same even straight after its plugged it in again.
Is there anything in a tuned file relating to IAT'S  that could cause this, as its fine on a stock file.
Reason I'm asking is because I had the same problem but mines away after I changed to the 518ak file, but still would like to find out.
Parts that have been changed are the usual suspects, MAF, IAT, TB,CTS.

Car is an 04 Audi a4 1.8t with a Unitronic tune.
Sorry no file or logs as of current, just trying to get the ball rolling for him.

Im sure it not the file that can cause this... U say that when you unplug the IAT i cures the problem?.. the IAT is part of the 5V system check for shorts to groun... Measure all the sensor on the engine and make sure they are connected to ground and not gives you any 5V or some thing.. Also Remove ECU open the case and look for possible Burned conecting copper lines.  It happened to me...

I get some like it when I changed TVUB one byte length more than it was (selected 6 x 1 instead of 5x1)