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Have you changed the distributor cap? A crack in the cap will cause moisture to gather and cause spark issues. Give the cap a very thorough inspection and also your wires. You may have poorly insulated boots on the wires and the spark will ground out. I had this issue and I looked at the engine at night in the pitch black. I found a plug wire arcing to the distributor base because of a bad plug wire. The truck lost power when the weather was moist. I hope this helps.
Check to see if the spark plugs are getting voltage. Check your
distributor and rotor and make sure the distributor cap is not cracked, and the
rotor is making contact. You can use an inductive timing light or use a spark
plug connected to one of the plug wires to and ground the base of the plug
using a jumper cable (do not touch the plug when cranking). When cranking you
should see a spark. If you do not it could be the coil or electronic ignition.
If you see sparks then you need to check the fuel pump pressure.
Did it spark well on all the plugs? Usually if you have no change in idle with two wires removed it needs a new set of spark plug wires. If it was cylinder 2 & 3 (side by side) then you should suspect a head gasket. Does the Bronco have multiple coils or a coil pack with multiple inputs? Are these two plugs hooked up to one coil?
If your distributor is lose than you need to check the timing. Pull a plug out and put the plug wire back on it. ground the side of the plug and see if you get any spark. It should be a bright blue. If there is spark than put the plug back in. But I would first check the timing.
When your facing the front of your bronco looking into engine compartment, on left hand side in
sequence is 1, 2, 3 front to back. on right hand side it's 4,5,6, front
to back. The distributor rotates clockwise. On the top of the distributor, is 1-4-2-5-3-6 starting at the little mark on the cap or TDC. Hope that helped.