back story, Gen 1, in a mini sand rail, had an issue with fueling, it would idle fine and rev up in neutral but under load it would stumble past 1/8 throttle, determined that fuel pump pick up was clogged, replaced the fuel system with 100 micron pre filter, 044 pump, 1:1 regulator and filter prior to fuel rail, ran great!
next day started it up and was running bad, determined by pulling coils that 2 and 4 were not running, swapped coils, swapped spark plugs, the problem did not move, pulled injector rail all injectors squirting. checked compression, not great, 150 +/-5 at all cylinders.
I'm thinking the next thing is swap injectors and see if the problem cylinders move? sort of at a loss here, is there something else common to cylinders 2 and 4 that could cause this?