Why would my truck run like garbage with the maf connected but run like new...

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maybayus123

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...unplugged? read details within? The maf is brand spanking new (not to mention this is the second brand new one to confirm the first one wasnt faulty). Literally with the maf connected I get no codes no CEL but I can floor it and it misfires so bad it wont go above 1500rpms and will barely idle. Now I can unplug it while its running and the engine instantly smooths out the idle and it runs like a CHAMP, and I mean like a whole brand new engine was just dropped in (but the CEL comes on and of course its for the maf since it is disconnected) what gives??? I ran the wiring harness all the way to the main ecu harness grommet going into the firewall and see no visible bare or broken wire. Its a 1994 mazda B3000 V6
 
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