Holley 4 bbl linkage hanging up

My Holley 390 4160 accelerator linkage hangs up going back to idle, from cruise. It holds the idle to 1100 RPM. I can get it to drop down to low idle (850 RPM) if I blip the throttle. I have a 3/4" 4 hole plastic spacer on an Offenhauser manifold. I saw mentioned somewhere that the spacer might be catching the throttle plates. If this is the problem, how do I fix this?

bwhitejr