[devildg4671]

I just picked up a used Bbk throttle body for my Mach 1. The guy who sold it to me says he removed it off of his 2003 Mach 1 with no problems. I installed it and testes it out. I have high rpms very stiff throttle and hanging Rpms roughly at 2000. Ive installed a restrictor plate, with no change.
How can I tell if this is the correct tb or is there anything else I should try to fix this issuse