Odd Problem

chewy said

To me, Sounds like Ignition or Timing. I would have leaned toward ignition with the lights thing, but you've already swapped out the ignition box.

Have a spare starter relay? They have some play on ignition, maybe swap one in that you know is good see if it makes a difference, but I dont think that would be it.

Where you've already swapped in a module, distributor, coil & other, I have to wonder about cam timing. Anything strange happen recently. How old is the timing chain? Think you may have jumped a gear?

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Switched in a spare alt and nothing, along with a new dizzy cap.

Fuel pressure is 6 psi at one minute, and 8.3 the next. I almost wonder if the pump is not functioning correctly and pumping more air than fuel? The gauge just might be reading inaccurately high. I swapped out the pump with a spare tonight, so I will find out in the morning. I did hear fuel perculating in the carb after i shut it off after running this evening. This is what is raising my fuel suspicions, but it must be lack of fuel or vapor lock, as it does it when cold.

It feels like it is going up against a wall from launch, with a lack of power, but as the car and motor gain speed, it takes off with usual power and cruises nicely without missing or popping.

I dont have any popping or backfiring while on the gas, so I doubt that it is cam timing. The motor has 20000 miles on it and it using a double roller chain. nothing strange or abrupt happened of note. I just noticed it develop while driving around on Sunday.