The air shrouds provide nothing more then cooling for the injectors. None
of the air for combustion comes from the injector shrouds. Air is actually
sucked from the manifold and ran back into the intake by the shrouds. What
is more likely is a bad injector that is squirting, not spraying. John C.
has had an injector do this and it caused missfiring and backfiring at low
rpms...like under 3k. I would suggest you pull the injectors and do the
spray pattern test like in the bentley.
HTH
Marshall
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