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Data Link Connector (DLC) Pin
Class 2 Serial Data
Battery Positive Voltage
My hummer H2 2003 did the same and I checked the coolant it was low.Refill the coolant and start the vehicle,if problem of reduced power persists check the thermostat if its not faulty.Hoping this will solve your reduced poweproblem
The fan motor is down on the pass side. follow the 2 wires that come off the motor to the heater fan resistor. If you can unplug that it. Most likely the connector will be burnt and so will the resistor. Replace connector and resistor.
check engine control fuse and then switch the coil packs around again. Rescan, and see what you get. Then switch to different coils again and rescan. Mine was a combination of a blown engine control fuse and one bad coil. My friend had the same, but it was 2 bad plugs and one bad coil.
When the light flashes it means you have a catalytic damaging misfire happening.. Most likely a coil or spark plug issue but could be something else. Get it fixed ASAP because if you toast your cat its going to get expensive
When the check engine light is flashing that indicates an engine misfire, which is catalyst damaging. Because you said that it generally only happens up a long hill or at higher speed, and it doesnt happen all of the time, most likely you are in need of a full tune up.