This motor has the distributor on the front of the motor in the timing cover.
This was probably the worse idea an engineer ever had. The issues were the water pump. The pump leaks out the weep hole right on to the distributor and causes all kinds of running issues especially under load. They even put a drain hole in the distributor for when the pump leaks, the water will drain out of the distributor.
I know you checked the wires but I would replace them. That is another engineering goof up. They are extremely tight and routed next to heat.
My suggestion is to change the cap and rotor and look for rust in the distributor. If there is, replace it.
Change the wires as well.
Images (Click to enlarge)
Monday, April 13th, 2020 AT 5:07 PM