Did you replace the MAF with a OEM or OE unit?
Also, I would try to identify if the problem is within a single cylinder or across the board. Once the engine is running rough, try pulling off each injector clip (one at a time). If the engine starts running even worse (or dies) then onto the next cylinder/injector clip. If pulling the injector clip does not effect the engine at all, that cylinder is your problem.
Best of luck! Test for compression, spark, and the above should help with fuel.
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P.A.T.T.
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