I would check the fuel itself.  Make certain you have good gas.  I went
round and round on a Dodge van one time in Baja...spending about 10 days
swapping in new and used stuff to make that thing run.  Had to ride my bike
to the nearest "town" for parts...an all day deal without any guarantee the
part would actually be there on the promised day or be the proper
part..Someone (beach front mechanic) suggested I drain all the fuel and
start over....and sure enough...it started right up and ran fine.

   Gasoline in Mexico, at least, is often very poor, and now I know some of
it is so bad your vehicle will not even run on it..

  Don Hanson