This info is off the top of my head, though I'm sure it can be found somewhere on the internet.
Diag mode - Remove power to ECU for 30 seconds. Run car til it is warm. Turn off. Short wire T to E1 (get a wiring diagram, there should be a fat plug with just these 2 wires in it). Then switch the ignition on. Blinks of CEL show codes.
Power dropping off - Could well be faulty/old/shit knock sensor. That's a can of worms. Search for can opener.
Hen
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