Ignition (or fuel?) gremlins
Bit of a poser: my car starts first time, runs perfectly well for about 15 mins then starts to misfire and eventually grinds to a halt. Wait half an hour or so and you can repeat the exercise. Would seem to be heat related but I'm not convinced it's fuel (as in hot carbs) related since it happens on some freezing cold days with the bonnet up. My guess is the electrics (coil possibly). Weather (no garage) and work are preventing me from getting at the thing so I'd appreciate any thoughts of where to concentrate when the sun comes back.
Spec: 1972 Midget, Twin HS2 carbs, Aldon Ignitor (hall-effect sensor), alternator conversion, solid-state fuel pump