It's still idling between 2500 - 3000. I can't find a vacuum leak anywhere, and I used the start fluid method. And carefully examined all of my hoses and fittings...

Is there a way to use a boost/vacuum gauge to determine if there's a leak? ie, the vacuum PSI at a given RPM?

My Scangauge doesn't return anything when I switch to TPS, it only shows

__TPS with nothing to the left of it.