Allright guys, heres the situation. Lately, I've been having a problem with a surging idle in my '90 K5. Its got hte stock 350 engine with TBI. Well, last night I got in there with some lights and started poking around, and I found something thats busted, but I'm not sure what it is, or what it does. its a short adjustable rod that comes off the side of the throttle linkage. It *looks* like the rod would attach to a black rubber vacuum diaphram located nearly straight back against the firewall. The metal clip on this diaphram is broken out, and the rod had dropped down onto the block, so I didn't see it at first. Now, what does this rod do??? Something to do with the cruise control system (which doesn't work), or could it be part of the cuase of the surging idle. The idle by the way, only gets bad once the engine warms up..... Where did all these damned dirty apes come from!?!