Toyota Tundra P Codes (Powertrain)

I Purchased New Spark Plugs (ngk (4589) Ifr6t-11 Laser Iridium Spark Plug) Now It's Throwing Multiple Misfire Codes P0300, P0302, P0304...

I Cleaned The Mass Air Flow Sensor. Cleaned Throttle Body, New Air Filter. Wire Red White And Green, Yellow 4.92 Volts At Plug. Still Light...

Hi, I Have Dtc P0031 And Went Through 2 New Sensors But They Make My Engine Surge. No Check Engine Light Came On. Thank You For Your Input.

Is There Anything I Can Do To Diagnose This Myself? Would A More Advanced Code Reader Be Helpful? I Got The Code Read At The Auto Parts...

2001 Toyota Tundra V8 4.7l 178,000 Got A Code P0171 Running Lean And O2 Sensor Heater Element. I Cleaned Maf And Briefly Checked For Vacuum...

The Truck Drives Well With No Problems Noticed. No Stalling Or Rpm Issues. We Got A Check Engine Light Otherwise We Wouldn't Have Known...