Thanks for all of the suggestions! I'll start trying to troubleshoot. Unfortunately another issue my car has is that the tach is frozen, so I can't tell what RPM it is at, however I think it's higher than 2000 RPM, it sounds pretty high. FWIW the car has always been garage kept, even before I got it, and only has 10k miles, so there isn't much in the way of corrosion. Looks like I'll be giving myself a crash course on the throttle and linkage.