I have noticed that when I am in gear with my foot on the brake, there is a slight shake. I have seen old clunkers do this much more violently. Any clues?

 

Mine did that when I blew the head gasket, lol. It can be bad gas, clogged fuel injector, improper gap on plugs, etc. I would start with some fuel injector cleaner, fresh tank of gas and check the plugs for starters.

 

I Agree mine did that when the gap on my plugs were off and again when i got bad batch of gas in my tank!

 

I had that with some bad gas too.....I used some cleaner I think and just did some driving..by the next tank I got elsewhere, things were fine.