I agree that the problem is likely the return line plumbing, but if you want to do a simple and quick injector test (that I recently learned from someone I met on this forum), get an infrared thermometer (the type with the laser pointer) and fire up an engine from cold and let it run for 30 seconds or so, then shut it down. Immediately measure and record the temperature of each port on the exhaust manifolds. They should all be the same, one that is substantially cooler indicates a leaky injector. You can do a similar test for compression by disabling the fuel system and cranking the engine over for 10 seconds or so. All the exhaust ports should be the same temp and cold one indicates low compression.
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