Hello,
Some updates on my problem. I changed the cable of the alternator that was faulty. The alternator is in good condition.
I also sanded the 3 motor sockets to get 12V at the injectors.

But the engine slams loudly when it gets warmer so I am looking out what it is going on and I came up that I put a high pressure oil pump but didn't put an oil radiator et changed the oil grade from 10w60 to 5w50 just before having all theses troubles. So is it possible that my oil pressure is too high and make the engine run bad?

I am going to replace the pump by a standard. Maybe get back to 10w60 and check/change my connecting rod bearings and crankshaft bearings as my oil is currently contaminated by fuel even I only started the engine, it's maybe better to be sure that they aren't hurt.
Is a too high pressure deadly for the hydraulics tappet? Shall I change them again by new ones? I changed them in decembre and they haven't done a mile yet.