Under the wire harness at the end of the connector is a release tab just push that and lift up on the harness/ connector. The other end of the connector will disconnect when the lift high enough on the other end.

The EDS opens the egr valve and monitors MAF expecting a reduced volume of air. If a reduced volume is indeed detected boost is allowed. A diode can be used to fake the MAF reduction.

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92 e300d2.5t
01 e320
05 cdi
85 chev c10