Injectors can be tested by removing leakback pipe and T pieces from injectors, place pipe in a bottle, disconnect injector electrical plugs and crank the engine for 10 to 15 seconds, any injector with more than a slight dribble of fuel around the T piece hole will be out of spec. If all injectors are fine then you may have a leaking high pressure fuel pump. A member local to me had the same symptoms and a new seal kit solved the problem.
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