69 Mustang 351W edelbrock problem

Have an eldelbrock 1406 4 barrel on my Mach1 4 speed. Cannot get the throttle linkage (cable) to return all the way every time. Often sticks at 10,000+rpm at a stop. After market 4V throttle linkage bracket and a new throttle cable. Everything is clear and no apparent hang ups. Hate to stomp on the throttle every time I stop to get it to spring back all the way. Anyone else have this problem or a fix?