Regularly maintenanced car has progressive power loss - 1997 Toyota Supra
Check the basics - check compression and engine tune. Check for a dirty air filter (https://www.yourmechanic.com/services/air-filter-is-clogged-inspection), dirty fuel filter (https://www.yourmechanic.com/services/fuel-filter-replacement), proper fuel pressure (https://www.yourmechanic.com/services/fuel-pressure-regulator-replacement), clogged exhaust or catalytic converter (https://www.yourmechanic.com/services/catalytic-converter-replacement). A YourMechanic professional can help with the diagnosis of your...