Release the Cancel button once the LED lights come on. This resets both the printer and the NVRAM together. Press and hold the Reset button near the back of a 5P or 6P printer as you turn on the power. Holding it for less than 20 seconds resets the printer only.
Once the throttle body is exposed, spray the throttle-body cleaner inside the air duct, and use the brushes to gently dislodge the dirt, gum and varnish that are present. Note: Be very careful not to let the thin, plastic spray nozzle (or anything else!) fall into the throttle-body opening.
A bigger throttle body will allow more air into the engine and will somewhat improve the throttle response. More air = more power. A 70mm throttle body is a nice step up for stock or lightly modified 4.6 engines. A 75mm throttle body is a good step up for cars with a good number of bolt-ons. If you decide to go up to the 75mm TB you should get the car dyno-tuned immediately. Flowing more air means you need to flow more fuel to avoid going lean in the critical Air/Fuel ratio. The addition of an upper intake plenum, a throttle body, and a high flow intake with proper tuning can show nice results.