I've seen that happen once, when a partially clogged fuel filter tore through and released a bunch of sediment into the rail and thus the injectors. All eight clogged.
Failing that, or failing some great jolt that banged loose some of those rail rust deposits, injectors usually fail individually, not en masse.
Two years ago? Something's making you question this now?
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1993 Rockwood 28' Class C - Ford E-350 7.5L
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