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I installed shorty headers on my 95 F150 302.and #4 spark plug is close to the header tube.I tow a 4000 lb travel trailer and when I tow up hills #4 spark plug wire boot will burn through and will misfire.I have installed boot protectors (1200 degrees) and header wrap but still have the same problem.This only happens when towing up hills.Is there anything else I can do.The engine temp is normal.
Are you sure the exhaust isn't leaking a little in that area? Maybe check that with some seafoam, or use a laser thermometer to compare temps at different points across the manifold.
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