I would suggest you a Haltech Sprint500 ECU, wired in parallel with your OEM ECU just to run Ignition and Injection side of things. Really does wonders!
RYSO.
Did the OP sorted out the problem?
He can email me at RYSO77@hotmail.com as I'm an authorised dealer and Certified tuner for Haltech ecu's.
Thanks,
RYSO.