vacuu;m leaks ??

What is your question?

code 44 after starting car it idles rough and stalls until good warm up period or driveing for 5 minutes check eng lite comes on and will go out after reving eng a few times and then while maintaining a steady speed of 45 it will come on again. this occurs every time after a cold start and almost always while engine is warm. what ways can I check for vacuum leaks (what is normal vacuum pressure) on system and maybe the intake manifold in particular ??