my problem is really frustrating, i ve been trying to sort it out for last month.
it is 289 C code 1965
it starded from unequal engine running, i replaced all old worn out parts like spark plugs, wires, coil, dist. cap, finger etc. it didnt help. checked gap if it was set to 0,38mm( 0,017 inch ?) anyway like the book says, i checked the carb if all the settings were right and they were.
so we checked timing and it was completly out of scale, that we were unable to set it by rotating the distributor(i dont know how this is possible), so we had to take the distributor out and set it on 1 with both valves closed and the cylinder no 1 at the top point, the way it should be.
all adjustments done on warm engine
then we set it to 8 degrees using timing light, and it runs perfect, drags well.
but the next day, I put it to D and when i rapidly press gas pedal there is like a gap, like a ping or something, sometimes it would turn off the engine, but when i press the gas pedal very gently it goes fairly smooth, although i can feel a lack of power.
then I check the timing again and it shows 14 degrees, so we adjust it again and again but it keeps changing timing somehow.
i checked mechanical advance diaphragm and it is ok. today i took apart the distributor to check the springs inside, they are different from each other, one of them is loose a bit, i have a video of that i can post it later if you may need it. i compared the springs with the ones my friend has in similar distributor for mustang 66 and they are very similar.
i dont know what else it could be, the season has started and i would love to enjoy my ride, can someone help with this issue please?