[David]

I've been fighting a similar problem with a '78. I replaced the WUR, checked the injectors, replaced the o-rings, polished the fuel distributor piston, checked fuel delivery and pressure. None of these were the problem. I found if I manually lifted the fuel distributor flapper, the car accelerated fine so I figured it was a vacuum leak. I replaced the fuel injection runner gaskets and boots and in the process dropped a nut in the intake, doh!. I didn't realize the nut fell in the intake so I start the engine. After pulling the engine and replacing the valve, I found two broken studs on one side and I haven't checked the other side yet. Now I'm wondering if the broken studs are keeping the engine from pulling vacuum as the engine is rev'd.

I'm curious to find out what your problem is. Hopefully you will find it before I've got the engine back together and running, because I'm going at a very slow rate.