2000 Mercedes ML320: Has 82000, warranty still available on some things. Misfire Code is P0305 (Cylinder 5)

My SUV is shaking when I am at a stop light/sign, when I am in reverse, and when I am at 15,000 RPM's.

All other forums suck, so I am hoping that this one will have SOME responses!

Yes, I know that it COULD be the MAF andcleaning it had no impact.(but that would affect more than ONE cylinder, right?)
---> Plus when I unclipped the o2 Sensor I had a reaction, so I know it's not DONE!

I have replaced the plugs yesterday and today I replaced the wires for Cylinder 5. I fixed them with hope and was left with disappointment!

I need help with ANY advice, I am losing patience and I am doing my best to avoid going the dealership.

Thanks for taking the time,
Frustrated

 

had same problem with wifes 2002 ml320 changed all plugs and wires at same time fixed problem the old wires looked good but i still think they were problem not plugsbosch had resonable price wire set good fit good luck

 

also check coil pack what i did was swaped with working cyl to see if problem followed brought parts online from mercedes benz parts direct great prices compared to dealer