Just to update. I have found out the problem with mine now. It was the Neutral Safety Switch. located on the transmission. Very easy & inexpensive to fix. I found the part New Online for about $50. Local auto parts stores charge close to $300. Hope this helps someone else. This seems to be a common problem with these.

 

So part was changed and resolved? Havnt got to mine yet. Just fixed the rough idle issue. Ordered a new cat back and catalytic converter from summit racing and a new downstream 02 sensor. Problem resolved. Runs so much better and almost doubled the mpgs (was only getting around 8 mpg). Hopefully weve helped others. Tired of reading problems with no real results.