also when it idles its fine just a lil lil up and down rev im talkin maybe 20 rpm diff but when i touch the gas or let off the gas while driving then it drops down to 300-500 then back up to normal, and also when i shift or let go of the gas at high RPMs it takes years for the RPMs to come back down, figure this out and ill be greatful, OBD2 JDM b16b CTR swap into 92 CX hatch converted to OBD1 running USDM P61 92-93 GSR b17 ECU, let me know what you guys might think it is

 

Check your tp sensor

 

get the right ecu

 

that ecu is supose to run the motor, im not gonna get a PCT CTR ECU which is OBD2B and get another conversion harness and a second O2 sensor

 

run an obd1 p30