Ok there is dark blue smoke coming out the exhaust in the back on my 1994 Dodge Caravan Le some say it's the valve stem seal's others say it's oil dripping on the exhaust inside i don't know and it's really bad only when i start it up and when i stop at a stop sign it does not do it when i am driving i sure hope somebody can help me and i hope it's just a small problem. Also i was told to use stop smoke has anybody heard of this product. Plus it does not loose power up hill motor does not make bad noises it runs great please help.Oh another thing that went on me was a plug in the back of the brakes it plugs in the back behind the brake pedal because the brake light's where staying on now they go off.