Starting a new thread. Purchased a 2004 coupe in May. Car has rough idle at stoplights.

Here is what I have done so far:

Removed and cleaned MAF
Removed and cleaned throttle body
New K&N filters plus cleaned housing and air ducts
New plugs
New fuel filter
Ran through 2 bottles of Techron injector cleaner
Oil and Filter

Also had my mechanic check for vacuum leaks

No CEL and no codes

Any other thoughts?