I think I had this same sorta thing happen, where my engine would seem to hesitate from time to time. I bought a $5 can of MAF sensor cleaner from Autozone and cleaned three parts: Two Mass Air sensors - the ones in the intake tubes, and the MAP sensor - Behind the intake manifold near the fire-wall. The problems almost dispersed.
I was thinking of doing plugs also, but will probably wait until I get my exhaust, and change the plugs right before I get a tune. I have 52k miles
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