Sticky thottle?
 

Okay so ever since I got my 2g its had an issue with not revving down too quickly after letting off the gas. You rev it, wait about 3 seconds and then it will start to drop. Even after I replaced the throttlebody it still did this. Thinking it could be the throttle cable being too tight, I disconnected it entirely to operate the throttle only by hitting the throttle by hand. Still she hesitated to drop the revs.Ive been told I have a burnt exhaust valve (dollar bill test) perhaps the delayed deceleration is a symptom of that?