As far as vtec not working it could be that the sensor issue, low on oil,ect... Also make sure none of your conections are crossed, sounds stupid I know but you would not believe how often I have had to fix stuff like that for customers. Did you put a new alternator in there and if so were was it purchased from? Not trying to be rude but have run into problems with some of the reman units on the market. When you checked your grounds did you clean any possable coropsion and possably exessive paint from them?