ok, i'm starting to get annoyed.
freshly rebuilt a20a3.
the car is pulling 21 inches of vacuum and holding steady. the car gets 30+ mpg on the hiway. the idle is smooth as glass.
when you first start the car and it's cold, the car hauls ass. Plenty of power. After the car gets warmed up, there is a significant loss in power. when the car is cold, i can lay on the gas pedal in any gear and there's absolutely no smoke. After the car warmed up, it's running so rich that there's some black smoke under hard acceleration and black crap gets all over the back of my car.
is this an O2 sensor problem? The O2 sensors worked before before rebuilding the engine... This loss of power problem has surfaced since the rebuild.