'88 240 b230f, LH2.2, Chrysler ignition

Currently idles about 2k rpm. I've already replaced all of the cracking vacuum lines and there's no change in rpm when spraying brake cleaner around the areas of intake that I thought could be leaking (gaskets, around the accordion tube before the throttle body, anywhere where there's a vac line connection, etc.). That being said, I'm pretty confident it's not a vacuum leak. The engine does die when I block off the tube to the idle air control valve, so I don't think it's a big air leak after the throttle. When I ground the test wire to shut off the IAC valve the rpm only drops to about 1500 (or a little over that) and when I tested the IAC valve (according to the Bentley book's instructions) it seems fine. When I unplug the MAF, it drops a few hundred rpm before climbing back up. If it's not a failing IAC valve or massive vacuum leak, what could cause such a high idle? Does anyone have idea on what else I should be checking for?

Thanks for any help

 

Oh, also I did notice that the pins on the throttle switch that are supposed to give continuity with ground when the throttle is all the way closed or open don't show that continuity. There is a click right as I open the throttle though.

 

Update: I took the throttle body off to inspect it and make sure it was closing all the way. I just had it off a couple months ago to clean in and it was still really clean, but I did notice the throttle switch connector terminals had some gunk in em so I cleaned em up. I also realized the idle adjustment screw has a lot more range of motion than I had thought (it was really stiff for some reason so I thought it was all the way in) so I screwed that all the way in and put the intake back together. I'm at the point with the screw all the way in that it idles a lot lower but really rough. itll come down to like 750 which I'm going for then the motor will kinda shake and it surges up to the 1000-1100 range and then comes down. when I come off some throttle itll sometimes dip down to like 500 and almost die then surge back up again. I really thought I would find some vacuum leaks but I can't seem to find any.