Throttle body swap

Hey yall, i just got a 3.8l throttle body and swapped it with my 1993 1.9l throttle body, its like an original mod for this car and seems to work for everyone. Im having a huge problem with the idle i believe. The car idels at 2500-3000 rpm on park or neutral. If im correct it should be at 1000. When i shift it into drive or reverse it decreases to 1500 rpm. I dont know what the problem could be, so first i disconnected the throttle and kickdown cablse and still the same problem. I was wondering what it could be, maybe the iac, or possibly the sensor on the throttle body itself(dont recall what its called) but i left the 3.8l sensor on it. Should i swap it with the original 1.9l's sensor? Need help asap, thnx.

dont you still need to use the maf from the donor car?