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Hi Richard

Welcome to the Forum

As you have a CHECK ENGINE light flashing you have a problem that needs attention NOW if you are not capable of diagnosing it yourself you need a Garage or Mechanic

The vibration could be a misfire, or a loose pulley or tensioner turning on the AC increases the load on the engine so will not help.


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Check the timing pulley. My e36 had this issue where the pulley had perished and moved forward and back, stopping the sensor from detecting the timing, causing a misfire.   Also worth checking the aircon pump bearings. 

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