EGR Block Unplug

I've just blocked off my EGR with the blanking plate kit and then unplugged the connector for the vacuum.



Since my car is a 54 reg, it has turned the engine management light on.



My question is will the ECU reduce the performance of the engine whenever the light is on?.. It seems to hit a brick wall after 3000 Revs.



I've got a working maf sensor and MAFAM Fitted on.

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