Could you please attach pics of the wires and pipes you are talking about? It would help a lot.
Your first problem comes out of the fact car is probably in "limp mode", trying to protect engine from blowing up, thats why it does not rev over 3k. Fact, that there is no exhaust is actually explaining why is your car cutting out - it's overboosting without cats or restrictor ring in place, be aware you might blow up your engine trying to rev it.
Lack of MAF will confuse hell out of engine as it is used to set correct air volume going into the engine, it might also explain, why engine do not want to idle properly or cutting out. Stock BOV is usually venting back into the system, not to atmosphere, but I wouldn't say it is a problem.