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Always go with the OEM plug.For your GMC use ACdelco plat.
Depending on how low your brake fluid went.You may need to perform a service bleed thru a scan tool. Preferably an IDS factory tool.Check for codes while your in there.We are close by in Ambler and have all factory scan tools for every car line.Give us a call and we will set you up with an appointment.
Most likely a bad sending unit in the gas tank.There may be a data pid that can be read with the Xentry tool.Most people fill the tank and then try to calculate distance to mpg,Also need to know tank size.To be safe fill again when about 1/4 tank min.Till you can repair it.
Never keep clicking after fuel auto shut off when filling.It can get in to the vapor lines and canister in the evap system.Bring it to us Ambler Tire.We use the Hyundai GDS system for diagnosis .
Common for central electronics unit going bad.
Fuse,Resistor or blower motor.$10.00 $200.00 or $700.00
Sounds more like a mechanical problem.Timing chain or guide.
That hose should pull off.They can be tight.Try small needle nose pliers and twist the hose as you pull it off.If Ambler is not to far for you.We are an SDD JLR repair shop.
Do you have power on pin 16 of the data link connector.If not check for blown fuse.If the scan tool powers up but you cannot read codes you have a problem on the network maybe a module pulling it down.
These cars have service bulletin on injector problems.You can try a pressure cleaning service.To diagnose we use the consult scan tool and disable each injector while looking at 5 gas readings.