Make sure that the wires are ran correctly and that the firing order in correct. Next make sure that the wires arent touching. If your still fouling plugs it could be from too much fuel or a possible oil leak from the valve seals. Sometimes fuel injectors can go lazy and dump too much fuel. Is it every plug or just one or two?

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89 Ranger- front and rear bagd on drop ibeams and custom 2 link.

85 Ranger- 4x4 31" tires. Soon to be V8 swapped with D35s and 8.8.