purge valve is usually located near the engine - im not sure on an eclipse - but it functions by opening the purge valve to empty fuel vapor from the charcoal canister. it should be connected to the intake and generally will look like any other black plastic solenoid and be connected with a...
looks like the same 3.5L used in KIA sedonas and sorentos. I would so turbo a KIA sedona mini van. Even have a provision for a manual trans setup - there's a plug in the firewall for a clutch pedal.
"reflashing" sounds like a shot in the dark. Yesterday I performed an ECU update on a car per another shop's diagnosis. The software was already updated and current. $85 to fix nothing. Your problem could be ECU related but "reflashing" an ECU probably won't correct your idle concern.
You need...
I bought my first DSM in January when it was traded in for $350 on a KIA Rio. I bought it for $550 and spent the last few months restoring it back to stock condition. I removed the body kit, sourced stock parts, replaced all the suspension and did some engine work - just to get it road worthy...