Yo.. Marc
I didn't read all post but am sure that someone suggested
-a fuel pressure test
-an AFM swap
-A FUEL REGULATOR SWAP
and finaly, a ECU test/swap

TIMIN???????? is all wire going to the distributor of, those stupid wire
have a tendency to go bad inside the distributor, 3 wires to that stupid
female plug that is always broken on the side of the distributor, it's an
easy check per Bentley...

This AS NOTHING TO DO WITH VALVES ADJUSTMENT!!!!!!

OR WIRE, OR PLUG, this is an injection problem, related to air/fuel
mixture..

It's NOT the OS..

So please, check the above..and tripple check those wires/grounds

If all turned ok... well, check compression, but am sure it's fine.

Cheers and good luck, Ben (in FL)
www.benplace.com