Points or Pertronix pointless

[Steve_in_NV]

Greeting Gentlemen,

First, thanks for the information posted it has been informative. I'm new to Mercedes, but not new to auto mechanics, this car is sophisticated. I have cleaned, changed, renewed various items on my car. 1972 280SE (W108)
99700 miles. The car runs ok, I change out the points to a Pertronix unit it seems to idle smoother, but cranks a little longer to start after the change-out from points I have noticed within the first few miles what seems and sounds like a "backfire" through the throttle body, it then clears up but the motor seems to hesitate and just doesn't seem to have power. The lack of power was evident before the Pertronix the backfire is new any thoughts? I have kept everything as it was just in case I want to return back to stock. Thanks in advance for any help or suggestions.