I've been trying to fix my idle issue, and just when I thought I'd succeeded, I learned I failed again.

Long story short, It started with the car idling OK in P-N but dropping to 5-600 rpms in R-D and occasionally stalling out. This led me to the IAC, which I replaced with a junkyard pull. The symptoms got better, where it wasn't stalling out anymore, but the RPMs are much too high. In P-N it idles around 1800-2200 and in R-D it sits around the 7-800, but that's only when you're on the brake. It wants to be in the 12-1300 range, and you really have to hold the brake or it tries to move. Looking through here, it seems vacuum leaks could be my issue. I searched as best I could, and haven't found one. I replaced the vacuum lines when I cleaned the throttle body last year, and none seem to have aged much.

I also checked the idle screw, and it is set to as low as it'll go. I also tried disconnecting the rod and rotating the throttle plate to closed to see if it'd drop the idle to where i want it, and I found it didn't change the idle much.

Now, during one of these times I was testing to see if what I had done fixed the problem, I thought I had success. It was idling in the 1000rpm range, which I figured was 'good enough' but then I realized in rooting around the intake manifold I had knocked the PCV hose out. Once I reattached that, it jumped to the 2000 or so RPMs I'd been experiencing.

So, right now I'm at a loss as what else it could be. I don't believe I have a vacuum leak, but I don't know what else could cause that idle.

Also, I unplugged the MAF and found no change in the RPM - it still held the 2000 rpm. I interpreted that as it wasn't the MAF causing the high idle, but typing this I'm not so certain of that anymore.

Am I missing something or do I need a better way to rule out a possible vacuum leak (visual and propane methods didn't find anything)?
--
If you're not driving it "like its stolen," are you really driving?