it will still cut fuel i think, cause doesn't the PFC use sequential injection? if there is no cas signal then it wont know when to deliver fuel.
if you wanted to be really baller, you could turn this into a soft cut rev limiter.
the way its setup on my haltech is i drop ignition to one cylinder at a time. just use multiple rpm triggers with the relay in series with the power signal to the coil packs.
or if you want to keep it simple, just rewire your coil packs so that there is a common power source
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