Sounds electrical. Did you say you checked the coil? My CDI box just went out, and i suspect due to arcing from a faulty coil. The CDI boxes themselves can exhibit some strange behaviour. Mine would start up fine and run until the engine got a little warm. After the warmup, the car would die until it cooled off again. In this particular type of failure, the heat caused enough resistance to shut down the cdi box.
It could still be a fuel delivery problem, either a faulty cold start valve that is leaking or a gummed up fuel distributor. Sometimes a lean runnig car will start and run initially since the cold start valve is supplying the engine with fuel. When the cold start valve shuts off, the car has a mismatched air/fuel ratio and cannot keep an idle.
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