1968 Ford Mustang — single-cylinder misfire comes and goes

Intermittent stuff lies if you only catch it once. Move a coil or plug on the 1968 Ford Mustang if it's cylinder-specific and see whether the code follows. If the cheap test changes it, stop and reassess. On “single-cylinder misfire comes and goes,” that was the fork that mattered for me. Keep sale price, fees, and rate as three different conversations. Climate here is different, so treat that as a local data point. If that fails I'll eat the diagnostic fee.