Too fast idle

One other has me wonder bout the solenoid, fuel gage doing weird stuff and heavy fuel fumes. Can you tell me exactly how many hoses are connected to the solenoid?

I will look again at the purge solenoid. I remember the connection but not sure how many hoses I saw. More to come

After looking at a photo of the EVAP purge valve/control solenoid, I'm seriously considering this specific area to be my problem and here's why. When I first replaced the hose from the PCV to the solenoid, the idle issue surged then immediately went to normal. This was fine for about half a day, then surged back high. I think I also told you I had replaced the PCV on this same day. I do hear hissing like from a vacuum leak but the place where this valve/solenoid is located means I need to use a mirror to see and repair/replace. According to the manual, and internet searches, there are two hose connectors. Which one goes where? I'm not sure if I have seen the hose for the other connector, and I will verify that today. All I know is this car eats gas now as if I have a bank account just to feed it (lol). Anyway I will let you know what I find out.

Update.
Here's what I did this morning.
1. Checked coolant and topped off
2. Checked the ecu fuse was good.
3. Started engine, idle still high so
I disconnected PVC line checked for vacuum, was good
Disconnected fuel pressure regulator line, vac good there
Checked booster vacuum, good
visually checked the vacuum lines on Purge valve solenoid, all connections good, and disconnected power to the valve.
4. Shut engine off. At this time the only connector not connected in the engine compartment was the purge valve solenoid.
5. Started engine, still high, connected solenoid valve plug, let run for about 1 minute, then shut off engine.
6. Restarted engine and idle returned to normal. Run A/C, Shifted transmission from park through selection ranges, still normal idle, back shift back to park, and idle still normal.
My synopsis is that when I had the bad PCV line to the solenoid, after a bit of time the solenoid stuck in the open position because of vacuum failure (would that be a correct guess?) By resetting the solenoid, the operation of the part went back to normal operations. What I thought was a vacuum leak was not, I wanted to find out if there was an issue of vacuum and the Evap service line did not give me any indication of a leak there either even with the engine running. I will let you know if anything else happens, but for now all seems well.

That also would explain why my gas level fluctuated as much as it did. The idle did sneak back up. I purchased a new purge solenoid. Will change it next.

I did get the purge solenoid changed. Idle is good. I did hear hissing near the tank, not noticing this before because I've gotten like really picky about the noises my car makes lol. Is the hissing sound normal?

When the car is running.

Here's an interesting design issue. The replacement PVC line is not sufficiently sealed where a secure plug was installed and the hose diameter is different on both sides of the secure plug. The hose has come loose at both sections of the plug. I think the fix for this is either a tubing splice or a single piece hose. It seems the leak is here. When the engine is running, and the hose pieces are held in position the idle returns to normal. So my temp solution is possibly using high temp sealant over the entire hose joint. More to follow.
And the issue of the hissing is when the engine is running and the sound is at or near the evap canister. I've not heard this sound in the four years I've had this car even prior to all this recent engine evap work.

I can try some clamps. It seems that whenever I either move the line the idle goes to normal then after a while the engine surges and goes back high. If I'm at a stop and restart the engine the idle is fine. The hose ends where they go into this secure plug t has some sealant that looks to have gone bad so any serious vibration cause it to lose seal. There seems to be no other leaks at the engine and electrically everything else is ok. When the engine transitions from normal to high idle the engine violently shudders as if to shut off.

Gentlemen, thank you for unintentionally saving me some time. My mom has an 01 century as a secondary car. A few months ago I did a full engine rebuild due to some blown gaskets, even polished the heads. It ran like champ and was getting 32mpg highway up until last week. I have the same problems, taking the throttle assembly right now. Hers is throwing a code for the iac but I replaced that when I did the rebuild, with mass airflow sensor and tps. Mileage has been slipping, idle getting rougher, and I too have noticed what sounds like a vacuum leak but, again, I replaced most of the lines. Very frustrating. Keep me posted if you find a solution, I will check back and let you know if I find a fix on this one. Best of luck!