I have 2007 Honda Accord V6, when I start it up in the morning it has a vibration when Im stop at the light / stop sign with my foot on the brake when the car is cold, it gets better as the car warms up but still has a vibration.
Also gets very bad when the air condition goes on or the fans, kick on again when stopped with my foot the brake.

1. No check engine light
2. Changed the air filter
3. Cleaned out the throttle body
4. Put in fuel injection cleaner
5 Changed the spark plugs
6. Checked for vacuum leaks (none)

Any suggestions ?

 

A vibration at idle could be from an issue with the motor mount. The V6 accord front motor mount in the direction of the front bumper is vacuum actuated, where the motor mount gets vacuum to change the dampening. I'd look for any issue on the vacuum line there or any cracks in that front motor mount.

 

I have the same car...had the same problem! There are six total motor / trans mounts on this car. I changed all of them. BOTH front and rear engine mounts were broken. Front was so bad the anchor had completely severed from the silicone. The Drivers side trans mounts are very easy to access and I found that the stoplight vibration was coming from them. The rear trans mount was broken in two. What I'm worried about is that the two new mounts I replaced them with aren't stiff enough because I am still getting the vibration / squeaking at idle. I'm going to run by the Honda dealership and see if there is a noticeable difference in stiffness in a factory mount compared to an aftermarket mount. It sounds like you're having the same problems.