Rough start and a rough turn off of engine

[DJcougar]

hmm...hope someone can help

Every time I turn on the car, or turn it off, I can feel shakin from the engine compartment
It does it most when I turn on the car and you can feel the engine move a little
It does it way less when turning off, but can still be felt

Im wondering why the engine feels like its jumping in the engine bay...and why it never used to do this
it generally got worse over time...till I finally noticed it

[01blkcat]

Check all your hoses, intake for leaks, then take the car to an autozone and have the codes pulled up... sounds like something is loose on the intake, or the IAC is on it's way out (or gone).

[DJcougar]

my dealer told me I had no codes about 2 weeks ago and its been doing this for months
where is the IAC located?
thanks