Found my problem. Worn crankshaft pulley keyway. I pulled one at the junkyard, and it was WORSE!!! That could mean this is a common problem. I haven't seen this mentioned anywhere yet. MUST WARN OTHERS.
When I replaced the timing belt in the past, I always thanked my lucky stars it came off so easily. Apparently that is a bad thing. The next one I pulled was pristine. It went on with the usual snug fit, and it went from running like crap to warp drive. I've had this car for about ten years, and I didn't know it could burn rubber.