HELP! 2006 Toyota tundra very high fuel trims

That was my next question, what the fuel system statuses are currently. I'd want to see you in closed loop (CL) with no faults.

P2195 and P2197 - have you looked at the FSM for diags on both?

Is your truck 2WD or 4WD?

The sucking symptom you describe is concerning, because an air intake leak, anywhere after the MAF would cause a lean condition. Mis-seated intake tube. Open vacuum line. I wouldn't expect a failed intake gasket on the '05-'06, it's a formed rubber gasket versus a flat one. I was going to tell you to consider replacing the upstream sensor, but the sucking symptom you just mentioned has me wanting to understand where that noise is coming from, and if this is just something stupid, like your intake tube isn't fully seated at, say, the throttle body.

 

Forgive me for being ignorant, what is the FSM? And it is a 4wd model. It hasn’t always done this going from open loop fault to closed loop, it’s being very erratic. I have no joke checked for vacuum leak three times, using carb cleaner to see if I can see different rpm changes, done a slightly pressurized smoke test twice now. I’m not perfect but I have really been thorough with looking for a leak anywhere. Unless there are some vacuum lines that are on the very back of the engine I swear I have checked every line. I wish I knew someone with another tundra that I could see if their engine makes the same amount of engine “noise”. It just seems too loud to be normal in my opinion.

 

Factory Service Manual

05-06 Tundra FSM.pdf - Google Drive

 

Oh gotcha