98 ex still having idle problems

[DAGAME]

1 month ago my car sometimes would idle at 1500 rpms and the cel went on and when my car would do this it would jerk back hard when i pressed or let go of the gas. So i replaced the air idle control valve and the cel went off and drove fine for a week, then it did it again and gave me the same code off the cel, what could be my problem?

[lorunner]

What was the exact code number? P???

[DAGAME]

dont remember the code number, but it was idle control system malfunction.

[DAGAME]

code is P0505, had 7 possibilities of what the problem could be, my mechanic at work checked all of them and everything is working fine, what could the problem be? Should i start saving for a b18?

[lorunner]

Hmm did you check for any vaccum leaks? Intake gasket, Throttle body gasket, etc.

[DAGAME]

checked, throttle body clogged/in proper adjustment, vaccum leaks, throttle body position sensor, IAC Manfunction, ect.

[DAGAME]

alright here is exact list of what my mechanic checked and everything is working perfectly, but yet the idle is fucked up, IAC valve mechanical malfunction,throttle body clogged port/improper adjustment, intake manifold gasket leak, intake air hose loose leakage, vacuum leak, ECT sensor incorrect output, throttle position sensor incorrect output.