2001 GMC Sierra 2500 Questions

All 2001 GMC Sierra 2500 Questions

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When I activate my washers, fluid is forcibly blown out the top of the reservoir. I do get fluid onto the windshield but am losing a ton of fluid out of the top of the reservoir. How do I correct the issue?
the plug gap changes to .040 from .060 with stock and platinum plugs. What are the bet plugs to use in my 6.0 liter engine?
very hard to steer and just about no breaks at all, hydra boost has a small leak at joint of casting between the 2 halves. hope you can help
I have a 2001 GMC 1500 4.8l and I am getting 11-12 mpg's on the highway, could this be an 02 sensor? My air filter is new, plugs, wires, and fuel filter are also new.