Time for a temp check on the exhaust manifold with a thermometer. Check right after running for 30sec and then again after it idles poorly. That is the fastest way to determine if it is an injector. Saves a lot of time looking for the bad hole.
Bud

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1987 300D Turbo, 175k mi., 1998 BMW 323i Convertible, 1997 F250 4x4 7.3L PSD