One Minor Problem With Engine Swap

My son and I had a 1989 CRX Si manual trans, with 107/K miles on it. At the beginning of March he was cut off and rear ended another car. The insurance company totaled the car. Given the drive train in the Si, we bought a 1991 CRX HF shell and swapped everything in the drive train and interior over. Everything came out OK and she runs and drives better than the old Si. The only exception is in the morning when we got to start the car. Its extreamly difficult to start, and if it does fire its idle is very low around 500 rpm, and not the usual 1500 or so for a cold engine. We've fiddled a bit with the throttle cable and were wondering where else to check/test. Anyone have any pointers as to what and how to check what may be causing a low cold idle and hard cold start situation? Thanks....

get a book on it and check the cold idle sensor/valve it might not be opening/functioning correctly

Thanks Viridion, tonight we removed the IAC valve and gave it a good cleaning. We also installed a new fuel filter. The car ran the same. We then adjusted the idle with the idle set screw per the shop manual and it worked. Sometimes its the most simple things. I must be spoiled thinking all of the new EFI cars are controlled entirely by the computers. A manual idle adjustment screw, who'd a thunk it!

L8R...