any suggestions as to why my 93 landcruiser will not maintain an idle, runs rough, loss of power, blowing white smoke. Already changed mass air flow sensor, plugs, valve cover gaskets. cylinder compressions running at about 150.

 

Maybe the fuel pumps pretty much dead?

 

Would that cause water/coolant to be introduced into fuel system and blowing white smoke? Not losing coolant anywhere else. Have put in some head gasket sealant (blue devil) just in case.