Ignition Question, My diaphragm was cracked--still not Prego! Options

[Robarabian]

Collective brain trust help needed.

Car is a 1971 1.7. Finished my rebuild, now 1911 CC's. (ECU non adjustable)

Car runs a Pertronix Ignition. Distributor was disassembled, cleaned and re-lubed.

Static timed the car and started it, and ran it for about 18 minutes at 2500-3000 rpm to break in the cam and rings. Did my oil change and then it sat for a few weeks.

Started it to finally set the timing and it started running rough, and I can tell it is on 3 cyl, sometimes 4, and spits, coughs etc. I know it isn't timed right and cant time it until it is on 4 cylinders.

Fuel pressure on an inline gauge is at 30 psi.

Pulled #1 and #2 plugs, they are the right color.

Pulled #3 and #4 and they are wet, and have remnants of being the right color from the cam break in.

Checked all the connections, but don't quite know where to start. The trigger points were clean in the distributor when I disassembled it, and it ran right for cam break in.

Cap, rotor, plugs, wires are all new. MPS holds vacuum.

Thoughts on what I am missing here or where would you start digging first.

I thank you in advance.

[emerygt350]

Good find. Make sure you follow Chris's instructions closely on that initial setup of the mps. You got his little screwdriver tool I hope? Also, do you still have your decel? Did 71s come with them? It is important to have that hooked up right to reduce the stress on the mps so it doesn't happen again.

[Robarabian]

Thank you I intend to. I did order the tool kit as well. 71 did not have a decal valve. Since this engine its 1911, pretty close to 2.0 I ordered the 2.0 spacer for the MPS hopefully to try to minimize it over stressing. I am learning this one step at a time for sure.

Good find. Make sure you follow Chris's instructions closely on that initial setup of the mps. You got his little screwdriver tool I hope? Also, do you still have your decel? Did 71s come with them? It is important to have that hooked up right to reduce the stress on the mps so it doesn't happen again.

[emerygt350]

Thank you I intend to. I did order the tool kit as well. 71 did not have a decal valve. Since this engine its 1911, pretty close to 2.0 I ordered the 2.0 spacer for the MPS hopefully to try to minimize it over stressing. I am learning this one step at a time for sure.

Good find. Make sure you follow Chris's instructions closely on that initial setup of the mps. You got his little screwdriver tool I hope? Also, do you still have your decel? Did 71s come with them? It is important to have that hooked up right to reduce the stress on the mps so it doesn't happen again.

Decel would be an easy addition if you wanted to be extra safe. I suspect it isn't really necessary with chris's kit. He may have other opinions. The difference between having it and not is between ~28pounds on lifted throttle and 23 pounds. Not a small difference.