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My 2001 Tundra has always been loud and fast. Lately, I have notice it struggles especially on uphills. Truck has 150k miles, K&N Air Intake, new spark plugs, O2 sensors. Not sure what is wrong. Any though??
 

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try running a higher octane and see if it makes a difference but the winter gas is a bit terrible on performance.
 

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2015 Toyota Tundra DC SR5 5.7L
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Clean the MAF and the throttle body, and run a can of SeaFoam through the tank.

Also, check the condition of the parking brake bellcranks. These can seize up and really drag a vehicle down.
 

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Wat oil r u using? I have 180k on my tundra it seems like it runs the same. I use mobile1 gold extended performance full synthetic, I would use that if u don't already & seafoam will help also. Does the k&n nd a recharge kit? If so I would try to get a dry flow filter. My buddy has the same as u then switched to dry flow n says he gets better performance. Injectors probably could use a cleaning also. I run octane boost to make thing stay as clean as possible n every 3-5 tank fulls I use injector cleaner. Everything I listed will = better performance I promise. Good luck

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Assuming that your tune level is good, I would say that your fuel system needs some cleaning, along with your air filter, MAF and throtlle body. If there is some carbon build-up in the combustion chamber and intake valves, then higher octane fuel might help. If you can afford it, a B&G fuel system professional cleaning would definately get things right in a hurry. A Seafoam DIY cleaning should help too, but is limited in its capabilities on a seriously fouled system. It is inexpensive therapy and is safe if you're careful.

This is what I use in my 2000 Tundra every 1000 miles and my truck loves it:

Item # 2300, L-X® Heavy Duty Chemical Supplement 2300 on Lubrication Engineers, Inc.

Good luck!
 
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