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I have a '95 Town car that has great a/c, except for when going up hills it shuts down. As soon as I take my foot off the gas, it comes roaring back.

I've checked the vacuum storage canister (black plastic box) on the left fender well, and it's o.k.
I've checked all the red, blue, green, yellow vacuum lines @ the heater control and the various bellows that they control for scrapes/ kinks and they all hold vacuum/pressure.
I've checked the main vacuum line coming out of the elbow behind the throttle body and it is new and o.k.

I occasionally get the infamous "low flow egr" code, but I think this is due to loss of vacuum that is required to hold it open. The egr is brand new, as is the pipe to the right bank exhaust pipe and we have 4 new o2 sensors installed too. Also the horse shoe shaped passage under the intake manifold elbow is squeaky clean.

Any other ideas would be welcome.........

Thanks,
Mike in Colorado