What would cause no spark to #1 & #6 cyls.? About every 6th or 7th start all is OK. Shut it off, count ten and the miss is back. This started with a problem with the security sys, a module & relay was remove. Then it would die or not start when hot. Changed SC sensor and the miss started. Replaced cap, rotor and plugs. Ch'd plug wires, OK. When missing there is no spark at the distributor cap, #s 1 & 6. Replaced cam sensor. Any other ideas?