Is this a naturally aspirated motor or supercharged?
I liked to pull the vacuum line off under the supercharger snout and spray straight into the intake manifold. I tend to like carb clean or brake cleaner over starter fluid because it's a bit gentler on stuff. It does take a couple good sprays thought.
Did you get a chance to check for spark? I'm thinking you did.. but can't look back at the moment to confirm it. I'm still thinking this might be the connector under the coil packs since you mentioned changing some of that stuff. Had a car I did a swap on with the owner. Between us.. we had the ICM connector sitting in place and hadn't snugged down the bolt that holds it on. Car ran great.. we went down the road for a test drive and the engine came and went nearly stalling. Then it stalled and we coasted it into a parking spot. As the tow truck was pulling in we noticed the connector, tightened it and that's all it was. Simple little thing left us stranded with a perfectly willing to run motor that couldn't.
