I have a 99 slk 230 with 131k , I just replaced the spark plugs an wires an ignition coils. Did an oil change . And I still have no gitty up , it has no launch  .drives slow until I get up to 25 mph an then I have to feather it or itll start misfire. I shut it off an it'll stop the misfire . Idk what to look for 


Have you scaned the codes? The check engine light should be on if the engien is missifring. 

It could be an issue with the mass air flow sensor, cataltyic converter or vacuum leak. 

Read the codes via the OBD2 port and let us know. 

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