They can foul the spark plugs quickly due to excess fuel and/or oil burning. The mechanical injection does not meter the fuel nearly as precisely as today's electronic systems and they can foul the plugs in a hurry especially on short start-ups that do not reach full temperature. Pull the spark plugs and look at them, if dirty at all, replace them.

The fuel injection is not likely the problem and making adjustments to it is not recommended unless you really know the system.

The distributor is just a point system, check for spark and if there is spark try a set of plugs.

Can you hear the fuel pump running? It is fused in the fuse box on the L/F fender IIRC.

Good luck!

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