2000 Dodge Van EVAP Canister Purge Solenoid.

Hello.

Ram 1500 Van 5.2L engine.

This solenoid, is it suppose to under certain conditions let vacuum to the evap canister at idle? I would describe its action as a sort of lapping of the canister. Also with vacuum guage connected to the non vacuum side of the solenoid and manifold vacuum connected and electrical harness plugged in at idle the vacuum gauge indicates the lapping going from 0 to about 5 but there are times when the needle will just sit at 5 tho I can feel the diaphragm cycling inside. This indicative of a bad solenoid?

I should say that the engine starts fine. However from a cold start it goes right into a low 500-600 rpm idle skipping any kind of warm up fast idle. The PCM is advancing the timing 27-36 degrees at idle. If revved the engine sounds normal on 1st rev but any subsequent revs the sound changes to an almost shallow tinny restricted rev. It idles I wont say rough but it is off to be sure. When throttle is applied under load there is a substantial lack of power and there comes a very deep bellow from the engine. It is however constant with no sputtering, surging, hesitating, cutting out. It never dies and starts clean and quick. At engine idle, normal operating temp vacuum gauge reads 25 or 30 cant remember which but it is constant and increases with operating temp from a cold start the vacuum line to the solenoid. Injectors are very loud and clacking. Gas is being burned at enormous rate. 30 miles ate a notch under half a tank.

Also, when under load Air vents reroute air to defrosters then back to vents when load is lifted <--- this has happened for along time. Back to the guy that owned van before me.

Its been given a tuneup. Spark wires ran correct to not induce. Took out the IAC valve, cleaned it and the port on the throttle body then reset it. Tightened/made sure tight manifold and throttlebody bolts. No leaks from gaskets.

Check Eng light not/never illuminated. PCM shows no flagged trouble codes. Fuel pump sounds as it has always sounded and seems to be able to provide. Provide almost half a tank in 30 miles! Ahhh! Haha.

Pray you, tell me. What is it that it is wrong?