With the maf., with the car running unplug the maf. There should be a very notable difference with the idle. Unplugged vs plugged. If no difference then I’d look more into the maf.

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1993 e300
1995 e320
1994 e320
2006 s500 4matic
2004 Jeep wj overland
2001 Ducati 748
2004 Honda shadow aero

Found out by diagnostics from a mechanic it’s the timing chain don’t know if it just needs a new tensioner. Mechanic said a rod is probably bent and causing knocking though most likely. The chain isn’t broke because the car starts but timing might have skipped some teeth


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Scan for codes 1200 /1208 are balance shaft fault perform
compression test compression should be over 150 all 6, if that's ok check the timing marks at 305 degrees cam sensor should be in inspection holes in the center, if only the right side exhaust is out may just need a new timing chain, if all that checks out get it to your shop and see if they can scan the car identify if a particular cylinder is misfiring , don't guess