Ian I spent about 1.5 hours on this yesterday. I think what caused the mil was sometimes when it "spooled up" I'd see the needle "bounce" as you'd described . This occurred after a cool down . I'd thought I'd had it "spot" on before. It would pull instantly and go to 14 then only drop back to 13 or so and stay. I would have spent longer but we started get slammed with snow . So I cleared the mil in my garage and backed off the boost about a eighth turn counter clockwise.
'03 Electric Blue 5 speed GT, bassani axle back single exhaust,addco oversize front,rear sways,wildfire strut bar,color-matched rear muds,xenon sides,mirrors,b&c pillars,both interior consoles,b&m sport shifter
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