A few weeks ago my Datsun would cut out driving for a short time but then start running on all pistons. Now it just runs on 2 cyls. Fuel pressure is to spec. Signal through all injector wires are good and not eradicate. Same on all 8 spark plugs, good constant spark. Timing is to spec. Compression is 150-155 psi across all chambers. Has fuel in tank and pump to spec. So wtf?