check the fast idle on the back of the tb. u can pull the tb off n then pull the fast idle off too. check n c if all the o rings are in there n clean the thing out real good. this happened on my ls motor. cept it wasnt 6k it was 2k, but it kept gettin worse. try it. if u need help finding where it i pm me n ill c if i can give u a better description.

 

check your intake manifold gasket and your throttlebody gasket and make sure you have all of your bolts tightened down on your intake manifold gasket and your throttle body gasket, the smallest little bit of air leaking can cause huge idle problems.

 

Thanks for the help. I will check them as soon as possible.

I just wanted to say thank you to everyone that has voiced a suggestion. Thanks All!