Originally posted by uclaccord
...there was this hose that was taken out from the stock intake that was no longer needed...
Maybe it was needed... The IAC valve, FITV, & a few other hoses & valves, are there to keep the idle steady when you turn stuff on (like the AC) or put it in gear. I don't have a '92, so you need to check a repair manual for your car. You probably have to reconnect that hose to a corresponding place on your new intake.
Also, look for vacuum leaks anywhere.
Or maybe your IAC valve is just dirty & it sticks open sometimes.