an ofab map sensor is only a 2 bar similar but not the same as a standard cossie 1. will only read up to 1 bar of boost which
ofac is a 2.5 bar i think.
they are not interchangable & a ofab ecu cannot run a 3 bar with a plug in chip. don't think it will run 1 at all.
by using a 3 bar you've completely fucked up the fueling. by unplugging it the ecu goes into LOS or limp home mode which is why it runs.

leave the 3 bars for cosworths