Originally Posted by Rick Long
This does NOT sound 'plug and wire' related... it sounds like a heat issue. Your plugs should be good for at least 50,000 miles or longer.
Agreed, that's why I suggested check wires first. If the wires have been bad for a while the plugs could get fouled, but with good wires and a strong spark the plugs might clean up, especially with a little cleaner added to the fuel.