code reader says cat not ready,o2s not ready(new o1 sensor,ho2s sensor not ready,. Throttle rpm goes from 1000 to 3000 rpm without incremental control in-between. Coil in iac checked 28ohms each leg,cleaned rotary valve and went from 1-2 thousand slow pulsing rpm to 50 rpm pulsing. If checking supply voltage, is iac valve the likely culprit or map sensor? disconnected battery,then pushed horn button and brake pedal but cannot eliminate the 1509 code with erase function. These problems started as result of defective alternator allowing battery to completely drain at night waiting for tow. A slow recharge allowed a recharge and engine started with noticeable multi-codes and problems. P1509 and NR indications are left to correct.
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