Wait my bad LOL, mixed it around, its prbz a head gasket problem, bluish whitish is more to do with internal piston rings or valve
Such good advice from ozhonda.
Grey smoke is usually caused by the car overfueling (too much fuel burning) Could be caused by several things (poor ignition,vacuum leaks, stuck injector are a few examples).
Start by replacing your ignition leads if you haven't in the past few years, and a new set of plugs while you're at it.
I didn't read what car you have, but if the map sensor doesn't bolt to the throttle body on yours (obd0) then check the vacuum line between the intake manifold and the map sensor which is on the firewall on OBD0 cars and is prone to causing a rich burn.
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