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Ever find an update/solution here? Really the only reason I haven't swapped to the Delphi ECU yet.

Late reply, but there's actually GM parts to add port injection to an LFX. LFX ecu also has a lot more support than the older ones did as well

I know one issue with the LFX engine is that the throttle doesn't fully open until 4k rpms, but 60% max is definitely unusual. Any update?