Please post photos of the coil, ignition unit and distributor and it may just make some sense to some of us.
THIS IS THE KEY !!! Series of pictures will clarify a lot of basic issues. Make sure you cover coil, distributor, ignition unit, plugs , if possible.
If you are not very experienced ( but even if you are) be VERY systematic during the diagnosis of the problem.
If we start with electricity as main suspect, we must exhaust investigating ALL of all potential electrical sources of the malfunction before moving to potential fuel and mechanical related sources of the problem.
It maybe painstaking but : you will learn a lot during this process and once the problem is solved you will be sure all elements are correct and set right.
You say you followed my suggestion , but this is unclear if you i.e. :
1/ replaced the condenser ,
2/ verified integrity of the wires leading to the points,
3/ inspected/replaced the points
4/ checked points gap, ,
5/ made sure the rotor and distributor caps are not cracked / broken ,
6/ cleaned the contact points on the rotor and under the distributor cap,
7/ checked for quality of the spark delivered by the coil (replaced the coil in doubt )
8/ checked timing (on a points system this can be done statically with a piece of wire and a small bulb
9/replaced (cleaned the plugs)
(I believe you changed high voltage wires from the coil to distributor and from distributor to plugs).
Unless I have forgotten something this is an exhaustive list which will either identify and remove the source of the problem problem of eliminate electricity as the source of the problem.
Only if
all this is done you should move to investigate fuel starvation / or overfueling as the problem source.
If fuel and electricity are not causing the problems you should start looking into mechanical area.
Without scaring you it could be something like sticking valve or lack of compression due to broken/ worn ring . It is not very likely but you will not know until you go through the motions very
S Y S T E M A T I C A L Y .
If you take shortcuts it will be very frustrating and will make it very painstaking to actually find and eliminate this problem. Sorry if you want to do it right you have to go step by step until the problem is solved .
Note there are very high chances the problem is simple , easy to remove and can be dealt with at one at little or no cost !
Miro
PS: Make notes of all you do before each test! Without this you will be going in circles.
PS PS Look here for reference on the electronic ignition for 131 :
http://www.guy-croft.com/viewtopic.php?f=4&t=1830 I have looked at Distributor code ZZ4 1402 1A1 and found no brefer5ence to it an any of may reference manuals... pictures please - does anybody knows this model / maybe this was one of UK market installed models by Lukas
.