The '66 (needs a nickname) has been sluggish lately. Seems when you stepped on the gas it bogged a bit before catching up. Turns out my #5 plug was extremely fouled out. A little more looking and the 5 wire was grounding out against the manifold. Plus... with the HEI ignition they never di-electric greased the wires. So its all new plugs and wires for her this week.