Toyota Tundra Trouble Codes

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...

Says Solenoid Is Stuck Off. Where Located?

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...