I just bought this car they said the msd box was bad because it didnt start at all so bought original distributer when the car finally started it was blowing greyish smoke out of the tail pipe we have changed the vavle cover gasket and o rings I also ended up buying fuel injector, fuel filter and the smoke has calm only when it runs for a little while but when reved it smokes more when I try to let it idle it doesnt want to idle right then I unplug the map sensor and it idles fine but when you but it in drive it dogs self and doesnt act like it wants to move

 

Please help

 

compression test it .. could be a junk motor

 

MAP sensor is critical for the ECU to know what load the engine is under.