So I'm back at it on my 91 dak. I've replaced the fuel pump, filter, both injectors, has new fuel (91+octane booster), and a new coolant temp sensor. My issue is that it will hold at 60mph no problem for a while but will begin to chug hard and I lose engine power and when I move the throttle it just cuts out, I have to reduce speed to 50mph and then it'll chug harder so I reduce to 45mph where it will chug hard, but hold speed... I can pull over or take left/right turns and it come out of it for a few seconds before returning. When I take turns I'll have all engine power, no stuttering, and can accelerate up to 50 before it starts chugging again.
I'm at my wit's end with this thing, next parts I'm getting is a MAP sensor and a coil... I don't know if I just got a lemon fuel pump or if there's something electrical wrong with it but it's so intermittent it's hard to pin down, immediately after my last fill up it ran 100% perfectly like this never happened. Tried testing fuel pressure but I couldn't get it to chug unless I was driving...
does anyone have a clue as to what might be going on or anything I should test? I really don't want to put a new pump in but I'm getting one just in case I do.


Edit : finally managed to get it to spit codes, the only ones that are related to the problem are; 51 fuel system lean, 27 injector control circuit, 15 no vehicle speed sensor signal, 42 asd relay circuit
i tested the injector connector while it was running and got similar results on both injectors, however the problem doesn't present itself until I drive

 

Chp pushed me off the highway. Had it running after 10 days straight working on this bitch.
new
Crnk,cam,fst idle sens.
Cap,rotor, coil
Fuel pump, filter.
Harness engine bay hands all in it.

Crank no start.
Swapped what I think is map, and mad sense. All throttle bodys sensors done.
Found I had no rubber gasket on bell housing for my crank sensor. Swapped it out too ( several cps senses gouged from flywheel. )
So I hoped gasket would help . ..
Back to test lights and dmm. The pdc when in run position I get 3 hits on the 1,2nd relays 1 hot on 3rd(asd) and 4th 1 hot and test lights flicks low green indicating a short?
Please advise