is it running on less than 4 cylinders?

you need to check all related ignition wiring.

ECU to dizzy harness > spark plugs. in in doubt, replace.

If you're not missing cylindrrs and it just randomly dies, check the ignition key barrel. (worn)

how old are the leads?

If they're old, i would be inclined to replace them.

take out the injectors, they're all getting fuel right?