Hi , I have a lexus SC400 1993 , it is sluggish when I accelerate (this is an intermittent fault ) but soon goes into full running mode , this only happens when the engine is in drive mode , but doesn't appear to happen in neutral or parking mode ,and it doesn't come up with an engine managment warning light ?,I have had all oxygen sensors replaced and the ECU tested which came back fine ,is there anybody whom have had a similar problem