Howdy folks! What could cause an excessively high idle....and by "excessively high," I mean around 2k rpm?

Here's the deal: I was cruising back home on Route 2. I upshifted from 3rd to 4th, and the revs went sky-high (well, to around 3500) and wouldn't come down! I pulled over and blipped the gas pedal...nothing. I popped the hood and jiggled the throttle pulley (???) on the back of the carb. Nothing, still revving like crazy. So, I shut off the motor, which continued to diesel on for a good 10 or 15 seconds.

I checked the throttle pulley, and it wasn't binding or anything--in fact, it returns to its stop with no problem. I restarted the motor, and the revs shot to 2000 and stayed there. I got home without any problems, but that dieseling kinda scares me and I want to fix the problem before something vital goes "boom!"


What should I look at first? Keep in mind that prior to the incident I described above, the truck was running great.


Oh, the specs: '87 Raider, 2.6l 5 spd, stock carb.


Thanks!