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Remove hose that is attached to valve cover and fuel pump. Remove the end that is attached to the fuel pump itself. Let the other end connected to valve cover. See if you can feel a pulse while cranking the engine. Put your finger at open end of hose that goes to fuel pump.

Try spraying carb cleaner around intake where carb mounts. If RPM changes, there is an air leak. Sounds like two possibilities worth investigating: 1. Intake leak causing AFR to be off. 2. I've seen the same symptoms when one coil is not producing proper spark. It sparks, but, not enough...