noelbhoy

I have a 2005 Honda Accord that is lacking power when accelerating. Prior to this problem, fixed the code for bad O2 Sensor (Up and Down Stream, replaced both). After that, noticed a high whistling sound when revving the engine, found out a worn out exhaust manifold gasket (got it replaced). No check engine light for O2 Sensor and no more whistling sound. The problem now is that when driving the car, noticed a lack of power specially going up and over overpass bridge. Really slow pick at start up from red light and on an on-ramp to freeway. Checked and cleaned fuel injectors, replaced fuel pump strainer, cleaned throttle body, changed transmission oil and filter, also cleaned the MAF sensor. After all these works, there has been a big improvement of the car performance but still lacks the power.

Any suggestions on what else to check?

Thanks!