Hi wise one's am here again 4 dat wisdom from d gr8 engineer's of nairaland,i have a toyota previa,dat av been using 4 like 2yrs now recently av been swallowing sm bitter xperience,its one week usage,3/4 days in a workshop,"black smoke,fuel consumption,jerking wen am on 100km/hr just changing plugs in 12/14 days,bad brainbox always.want 2 dump dat thing 4 now,& let everyone walk on his feet,but we all know lady's ;-my fiancee insist dat i hang on 4 now,but dis jallopy is eating deep into my pocket.pls just a straight advice from d engineer's dat knows about it...Thanks.