i put a used d17 engine in my friends 03 civic last night and it runs great but the idle surges up and down from 1-2k rpm, i am getting a check engine lightwith codes p0505 and p1505. i swapped another throttle body on to it and no change. i checked for vacuum leaks using carb spray and watching the 02 sensors on a scan tool, and pinched off all the vacuum lines but could not find any leaks. if i unplug the map and set a map sensor code then it settles down but if i clear the code it starts surging again. nothing on the intake side has changed but i cleaned the throttle body while the engine was out because it was carboned up. any ideas?