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keep in mind that MAF sensor won't even come into play until the engine reaches normal operating temp and the ECU goes into closed loop mode, reading off all it's sensors to make fuel trim changes. When the engine is cold and in open loop, you should be able to disconnect the MAF w/ no ill effects. A bad coolant temp sensor could be holding the ECU in open mode giving the horrible MPG? Just an idea!?!
Joel
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