When hot my 87 Mustang 5.0 will buck and stall. Normally it will 'restart' before engine dies completely. WHen this occurs the tach drops to 0 RPM even though the engine is still turning (but with no power). Because the tach drops so fast my guess is that the problem is ignition or electric base. I replaced the Ignition module on the distributor (TFI?) but this had no effect.
Any suggestions?