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Mopar issued TSB 18-48-98 addressing those symptoms. Click here to see the TSB.
Did you reroute the coil and spark plug wires as indicated in the TSB?
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Something is not right. Either the PCM is not getting the right information from the MAP and TPS; or it is getting those signals but it's not reponding by increasing injector-on time - we will need to plug in a scan tool capable of reading engine data to check that possibility. Or, we're getting fuel pressure but not the volume that we need at higher RPM. Can you check with a fuel pump tester that can test volume as well (click here to see sample)?
Looking forward to it.