Install everything and clear the codes. Drive it and see if it's any better. If not, try and retrieve any codes. If one of them is a code 56, you may have a bad D wire or a bad MAF. The way you find out is to unplug the MAF connector, and restart the engine. Let it idle for one minute, and shut off the key. Pull codes again. If another 56 comes up, the D wire is bad. If a code 66 comes up, the MAF is bad.
I have a hunch your old MAF was the problem, but I'm still susoicious of the ECM.
Take care
~Chris
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