I need help please.. my ford ranger f2 carburetor model iz not firing on cylinder 1.. the plug have spark and the petrol iz there but it wont fire.. if I trow out the firing order to 1.4.2.3 then the engin iz missing heavy but then cylinder 1 iz firing but as soon as I put the firing order back to 1.3.4.2 all cylinders iz firing accept number one.. I already tested the head.. changed the pulgs.. changed the plug wires.. changed the coil and changed the distributor module but the problem iz still there.. any one with a solution please email me njpb6426@gmail.com or whatsapp 0844506016