Actually what codes 181 and 189 mean is that you have reached the adaptive fuel limit at part throttle. Simply put the computer cannot add more fuel than it is giving now at that fuel pressure. The solution is is an adjustable FP regulator if you don't already have one. Raise pressure 2 psi or so at a time and try it. I didn't have this happen until I added my heads, I had to buy an adjustable reg. You don't seem to have many mods that would warrant this, but obviously the computer can't compensate, so a raise in pressure is needed.
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