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I am trying to trace down the same exact problem. All the readings (voltages) seem to be ok, but the damn thing still soots up my tailpipe and pops under decell (mostly cold). I've done all the diagnosing I can think of, so the next step is just start replacing components untill the problem is cured. I have replaced the O2 sensor, and ECT sensor. Next I'm going to replace the IAT sensor.......... then the expensive MAF. And no this is not normal. If all the sensors are reading correctly the ECU should be able to compensate to get the correct fuel mixture. I'm hoping it's not the ECU as I have an expensive Stillen ECU and don't want to have to fork out the cash to repalce that! Anyway, once I get the problem corrected I'll post how things went.
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