Mercedes 272 , 273 Engine V6 & V8 ,Check engine light misfires, rough running, transmission shifting

Found this multiple times when customers have brought their car's into me. Also note that these Engines DO NOT like "pinging" due to that the spark plug electrode likes to bend over and cause misfires as well. So if this is ok, pull the spark plugs and check for smashed electrode. Replace them if you do. Hope this helps!! Enjoy Guys