Hi Dave,
And if it isn't the MAF (I think you said you tried another one) 'scope the MAF and the TPS, preferably at the ECU if you can, as any drop outs from these (including wiring problems) will cause a drop of calculated load, and reduce injector pulse width as less fuel is demanded. I was going to add CTS to that list but don't think load value would be reduced if this had drop-outs in the signal. Anyway HTH,
Regards,
Nick Bell