Thanks 230/8 for your reply. It there a source for that plastic tubing???

I looked at the one way valves, I found that I could not suck air through them with my mouth and when I turned them around the other way I could suck air through them but it sounded like I was playing a comb with tissue paper. Like the diaphragm inside was oscillating. Is that normal??? I have two of them on my car and both exibited this feature.

I have not changed out the big line to the MAP sensor, in fact, I don't know what a MAP sensor is, but I will do my homework and find out, as well as check the line for leaks and a clamp.

I am aware of the big lines to the idle air valve, I didn't see any leaks there but they are old and probably need replacement.

Thanks again for your help................Dan