hi there people im wondering if you can help me, ive got an 90 spec rst running 1600 cvh low comp ported and cammed on mfi, ive put an early type ecu (red blue red) and new distributor on along with different cap, rotor, leads and coil but occasionly still have a misfire on boost running 16-17psi, plugs are ngk bcr8es, between 4500rpm to 5000rpm im at me wits end any ideas?????