I have 82,000 miles on it. I just bought it in November. Its been setting for a couple of years.

 

In that case my first guess would be fuel filter and be sure you have fresh gas,

 

Thanks it was running great.It still does unless i but my foot in it. I've only ran one tank of gas through it. The weather isn't been the greatest here.

 

Reminds me of my Graphite at 90,000 miles. O2 codes and misfire codes anytime I got into it.
Put 12 plugs and 12 plug wires on it - fixed. And it ran WAY better, I"d not realized how bad the car was running until I put those parts in it.

But it SOUNDS like you just bought it, is that right? If so, there is no telling what is going on. The fuel could be separated, or even varnished, if the car sat a long time.
The fuel filter/regulator could be at wit's end...
The MAF could be filthy...

If it were me, I"d take advantage of the fact that Arkansas will be seeing some GOOD weather this weekend - change plugs and plug wires (it is TIME) and run some gas thru it this weekend.
Likely, that alone will do it. Order plugs and wires TODAY - search "2003 Mercedes SLK320" and you will pay less than if you search "Crossfire".

 

Codes are for rich fuel, too much gas not enough air. I would look at the intake system. Blockage in the filter like a mouse nest, dirt etc.

 

I've changed all the filters. I'm going to clean the mass airflow sensor this weekend. See if that helps. Then order fuel filter.

 

I didn't even look at what codes he had.

Maybe he bought a car with a damn dead CAT in the intake.


(My favorite cat is a dead cat.)