i jus bought a 95 mazda 626 5 speed 2.0l I4. when i bought it the only problem with it was the alternator which i replaced along with a tune up (plugs/wires, distributor cap/rotor, oil change and pcv valve) but since then my car has had a ticking in the engine which i cant figure out, back pressure in the exhaust with alot of white smoke from the exhaust and the car doesnt hold a charge for very long. i was told that the reason its not holding a charge is because of the wiring from the alternator to the battery is setup with 2 8 gauge wires instead of 1 4 gauge wire. but me and my friend cant figure out the tick or the back pressure, we checked the timing and its perfectly lined up, any ideas?