That's a hard one because there's only a couple of possible things going on. First of all let me ask you, have you done any whatsoever mods to either your engine or to the electrical wiring. Well if it were my car, i'd have to suspect it being due to faulty or lose wiring. But then again how often does the engine light flicker. Just go back and recall if you did any kind of wiring or engine work. Because you couldn't loosened a wire in the engine compartment that's causing this prob.