Loss Of Power

Check air intake system.
Ensure throttle plate and linkage operate properly.
Check ignition system. See CIRCUIT TEST JB in TESTS W/CODES article.
Check fuel delivery system. See CIRCUIT TEST HC in TESTS W/CODES article.
Check for restricted exhaust system.
Check engine compression and mechanical condition.
On M/T models, ensure clutch is operating properly.
On A/T models, ensure transmission is operating properly.
Check for dragging brakes.