I have a 68 Mustang straight 6 1 BBL carb, 3 speed manual.
Noticed the other day that when driving at constant speed that the car hesitates (like I am letting off and pressing down on the gas pedal). It accelerates just fine.
No RPM gauge in car. When ever it is a constant speed, through city streets doing 35 or on the highway doing 60.
So, being an old car - where are the most likely problems areas - fuel pump? Coil? improper point gap? vacuum?