no 6 cylinder mis fire on 2002 Mercedes-Benz C230

seems like it's trying to choke off, stuttering. Have changed plugs and wiring. What might be other problems causing this?

Asked by for the 2002 Mercedes-Benz C230
Check your fuel pressure with a test gauge. I suspect the fuel pump. The problem with #6 may be something else. Check spark and compression on #6.
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