It is not important what etnicity alexander belonged to. what is important is what he was trying to build. Seemingly, most of you did not inherit that part.
The basis of imperialism is that you have to embrace heterogeniety.
Romans inherited it, so did Ottomans, Then the English and now Americans...
It is almost always the ignition system. check spark plugs including gaps for a start. Change the cables, check coils and the distributor. etc..