I have 2005 Lancer 1.3 Auto (4G13) driven 137,000. The acceleration is not good now (lost 30-40% of the power) especially above 4000 RPMs. What could be the issue? Choked Catalytics Converter? The car has been driven mostly on high-octane most of its life, on normal fuel it would do knocking.
Your thoughts PW gurus. In case its Catalytics converter issue, whats the solution, get it removed?