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I'd 1st check the condition of the engine ground wire, it should be corrosion free and tight
also check that the resistance of the spark plug leads ( 13-15Kohm / metre) and replace if any doubt or high resistance - Also replace the spark plugs if any of them fail this checklist:
also check that the fuel is getting through to the carbs and if OK then remove the distributor cap and check it for cracks and damage, do the same for the rotor arm and replace if required. also check the state of the wires that run off the speed pickup / toothed wheel inside the distributor as they can fret on the inside
Ok thanks for the update I wasn't sure as they changed over around this time
still worht checking the distributor over though as I've suggested and also check for ack of fuel pressure from the electrical pump at the tank.
If the connections to the pump are corroded or damaged then the pump could stop at any time or could not be running at full speed. Check that its relay switches in and out and the relay contacts are clean and bright – replace the relay if in any doubt and do the same for the fuse,
Ideally measure the pressure at the injector rail and if this is low check the pump as described and also consider changing the fuel filter as if this partially blocked this too will reduce pressure.
you would check for spark by removing one of the spark plugs and plug it back into its lead and rest it on the metal of the engine ( DO NOT hold it on place by hand) then have your assistant turn the engine over whilst you watch the plug. It should give a fat blue spark at regular intervals.
If not then check that there's power to the coil using a meter. If there’s 12V here but no spark then I'd replace the ignition module , part no. 8 on this link
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