A much better tech will be able form experience to guide you,

having said that, when my AMM was going bad and before it set the Check Engine Light on my car, what you described were the symptoms of a bad AMM - air mass meter - on my C230.

If yiou have an AUTOZONE store around go there and see if they can pull codes from your OBDII outlet. These codes can help lead you to determine the probelm.