I just purchased an edelbrock 65mm throttle body but the throttle body seem hard to pull. I reved the engine up to 8k RPM and the throttle plate only open 25% not even 3/4. the spring coils on the throttle body are really tight and I assumed this is what cause it. I unlock the nut and loosen the spring coils on the throttle and same thing happen,the plate wont open fully. Any help or suggestion?