1994 tracker at 8v 4x4 50000 mi intermittent stall

[TC2]

My 1994 tracker at 8v 4x4 50000 mi is intermittently stalling. I finally got it where it would crank with the test jumper in and got a code 42. It did start on test fuel and died when that ran out. It runs great sometimes for a 1/2 hr and sometimes 5 min. I have not had it die on me cold. Does this year have known issues with the Hall effect sensor? Is it plug and play or do you have to set gaps? Do you have to pull the dizzy to replace it. Thanks in advance!
TC