2005 c 230 kompressor

Have a diagnostic test with a code reader to locate the reason.

you have problem with coils [if have it] and module.PO300 to PO306

Also Could be wires. or vacuum leak... any check engine lights?

well this engines are notorius to rougth idle, but my sugestion is to inspect your coolant temp sensor, check for corrotion in conector if any clean or replace conector, your engine has two temp sensor one is a single wire for your temp gage and other believe green conector with two wires this is for your computer, if no rust or corrotion found replace the sensor.
good luck

YOUR CORRECT IT IS A COIL PROBLEM.... DO A REGULAR 6 MONTHS TO A YEAR TUNE UP AND YOUR CAR WOULD RUN PERFECT....

Take it to your local large auto parts store and have them scan it w/their scanner. They will tell you what's coming up in your computer for the car and get you going in the right direction to fix.

Hi, did you ever get an answer? I have the same issue. Thanks.

You should've changed the coil when you replaced the starter. If you could only do one at a time, I would've gone with the coil first. There is a brass plate that gets charred with carbon build up. Your banging on the coil shakes some of it off, re-establishing a good connection. You can sometimes get away with taking it apart and cleaning all off with a mini-grinder or rotary wire brush. This will confirm it for you and buy you time until payday or your next day off.

compression test, coil issue,

no flashing light and rough shaking will be part of spark plug but also a very bad miss fire. I am going to guess that your engine is a 1.8t if so you have 4 coils that sit on top of your spark plugs that most likely are arcing you will need to figure out which coil is failing or you can save yourself the trouble and replace all 4 and the spark plugs. before you do that though check your wireing going to your coils look for broken wires or the ground that is next to the #1 coil that is the one closest to the front of the motor and you. hope that helps. that will be the start to fixing your issue also when you pull out the spark plug look down the hole first and make sure that there is not oil in the bottom of the hole if that is the case you will need a valve cover gasket as well. good luck hope that helps