I have a honda civic 2009 (r18a1 engine), a few month back i was facing an issue of occassionally losing power at lower rpms, but the car would regain power beyond 3500 rpm, and it was occassional, half the time it would behave normally for weeks and some time go bad for weeks, i changed the Egr( the replacement was also used so its condition is questionable ), replaced the O2 sensor between the engine and Cat-conv, cleaned the Maf sensor, cleaned the throttle, changed the plugs and air filter about 2 weeks ago, but the problem persisted on and off , now its been 2 days that the car almost loses 80% of its power within 1700 and 2200 rpm, vibrates as if the car was running just two cylinders ( like when you remove a coil from a sparkplug while the motor's running ), at this point i am kinda frustrated and helpless and all i need is the list of parts that might be the culprit, so that i can just swap all of them to get rid of these problems once and for all. Thanks