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Sorry, missed seeing the part about already using noid light.
There really isn't way the MAF sensor, or for that matter plugs and wires, can cause this code. The ECM is not seeing the electrical signature of a functioning injector. This really narrows it down to injector, wiring or ECM. My guess is an intermittent wiring problem.
I will add this is based upon an internet search for the P0203 code description. I will try and confirm the description this evening in the service manual.
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