sorry, krawlr... what's the egr?

thanks for the input... seeing mechanic tomorrow... just got back from holiday break...

Good day. need help figuring out my prado KZJ-78W. when caught in traffic, or on prolonged idle, check engine light comes on and there's an odd vibration to the engine and the exhaust billows thick, black smoke on acceleration. this occasionally reverts to normal and light goes out after a while but ...