Toyota Previa Engine Low Power

Hi I Have 2004 Toyota Previa 2.0d4d T2. It Seem There Is No Power In Acceleration Especially On Uphill As It Only Does 25mph In Second Gear...

Seems To Loose Power On Motorway

About A Month Ago, I Had To Tap One Of My Spark Plugs And I Replaced My Flexpipe. I'm Not Sure If Any Of These May Have Anything To Do With...

Total Power Loss To All Electrical Components Eg No Ignition Lights Despite Having A New Battery.

Struggles Especially When Depress Gas Pedal. Sounds Like It Will Stall But Has Not. What Should I Check First? Let Me Elaborate On Skill...