96 blazer i was having po300 finally pulled the plenum and the spider was melted. I replaced it and it starts good runs ecept it is fumblin with a vacumm leak, i think its at the plenum but my concern is once it warms up it blows white smoke i checked the oil it has no water in it and the radiator fluid seems to be fine doesnt need to be toped off but i cant figure out what it is i did use some lube to help get the injectors out but i dont know how long it should take to burn off