Hello Yall from Houston, TX!

I have a 2002 Trailblazer. For some reason it shakes a lot when I'm stopped at a light. I can put it in neutral and it stops. I can leave it in drive and turn the a/c off and it stops or if I go on a long ride, it eventually calms down a bit.

A neighbor of mine has the same exact model and he was told it could be the idle sensor...

Any suggestions?