1-2 Minutes truck loses some power 3rd Gen

2002 3rd GEN 255K

I drive the truck from 1-2 minutes and it loses some power (in all gears). There is also a slight hesitation at higher speeds (RPMs). It almost feels like a fuel filter but not as extreme of a bog down. This issue has gone on for over a year. I have read just about every forum post on this issue and tried most everything that was a “fix”. The truck is very drivable there is just no get up and go like in the first 1-2 minutes of driving.

When I am higher speeds (40-70mph) the engine’s RPMs goes up but truck does not seem to accelerate much. I ruled out a transmission bc it goes fast for the first 1-2 minutes. I could let the truck sit for 10min(even when driven up to temperature) then get back in and same 1-2 minutes of great pedal response then sluggish.



Here is a list of what I have done to date (in order):

Changed Fuel Filter

Cleaned MAF sensor (Might need to change it I am not sure). Cleaned with MAF cleaner

Cleaned throttle body but did not take it apart.

Coils, plugs, wires all denso or Toyota OEM (plugs are single pronged)

Front O2 sensor replaced (Denso)

Front Catalytic converter replaced (Universal)

Rear Catalytic converter removed (deleted)

TPS throttle position sensor

Changed Coolant temp Sensor

Took it to a local mechanic and he could not find the issue. He said he did a fuel pressure check when I asked but I did not ask if it was done after driving for 5 minutes.



ANY HELP MUCH APPRECIATED