Hello! alright so my issue is that my 97 f150 4.2l 2wd manual is climbing in rpm after i put it in neutral to say coast to a stop sign or stop light rather than dropping down to idle rpm just for fun i completly unplugged the IAC just to see what would happen and it has resolved the issue however i hooked up a scan tool and while driving i noticed that the signal is still being sent to the IAC valve and its still sending the request to maintain it at 39-54% where as it should be alot lower (like 13%) so my newest question is that what decides what this signal should be, i assume the speed sensor is one but what else decides it?

the codes ive got are:
P1121 throttle pos inconsistent with maf
P1000 on board diagnostic ii moniter/ drive cycle test not complete
P1125 throttle position sensor circut intermittent
the truck doesnt have cats on it but the sensors are still hooked up (should i just unhook the sensors?) so there are a bunch of codes i didnt write down before clearing the codes so i know they will be back tomorrow

Thanks in advance!