I have an '05 also that I just brought out of retirement. She has 171K on it. I've owned it since around 40k. Identical to yours. Just recently I ditched the Nivomat rear shocks and went with the Bilstein ZW7 conversion kit. Huge improvement. Looking at sound system options. Unfortunately the Bose system (which I hate) makes this simple decision difficult. We have the dreaded "slow fueling" issue. I've been trouble shooting this for a few weeks now. I, like many others have found charcoal bits from the broke down evap canister in my tank vent lines. We've slowly but surely been getting those free and out of the lines. Fueling seems to get a little better every time. Yesterday I blew a good amount of them out. Haven't got fuel yet, but I'm hoping it helped. Once I get that solved I guess I'll replace the canister. Also chasing a small oil leak. I replaced the oil pan gasket last week and of course the o ring on the oil pickup tube (an absolute must on these GM vehicles). Truck was starting to show lower than normal oil pressure on cold start. Now that I changed that O ring she's back to 60psi at idle when cold.
I would recommend checking the power steering fluid. I would also get in the habit of sucking out the old and replacing with new every oil change or so. These trucks have hydroboost so basically the steering and brakes receive power from the power steering pump. Just a couple of weeks ago for just a second we lost power steering and brakes. I had no idea at the time what hydroboost even was. After researching it, I sucked all of the fluid out of the reservoir, twice. Both times it was pretty dark. But both time I did it, we noticed the steering and brakes both felt a little better. However, we didn't know it felt "off" to begin with.
I would recommend checking the power steering fluid. I would also get in the habit of sucking out the old and replacing with new every oil change or so. These trucks have hydroboost so basically the steering and brakes receive power from the power steering pump. Just a couple of weeks ago for just a second we lost power steering and brakes. I had no idea at the time what hydroboost even was. After researching it, I sucked all of the fluid out of the reservoir, twice. Both times it was pretty dark. But both time I did it, we noticed the steering and brakes both felt a little better. However, we didn't know it felt "off" to begin with.
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