Even tho unplugging the MAF worked, it may very well have a split in the pipe, or a joint clip on the intercooler has blown off (very common). Check all of the pipes first with someone revving the car for air leaking. Failing that it's more than likely just the MAF has gone down.
Also, whilst your doing some auto diy, it's worth pulling the egr valve off and giving it a good clean. When those things clog up, it massively reduces performance. You'll see the difference afterwards.
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