ANYTHING than can cause a stall at idle

I've replaced all spark plugs and coils with Motorcraft brand. Fuel pump, tank, and injectors are new. Ive replaced all my hoses and fuses. (Its a project car)

What else can cause a rough idle and stalling at a stop light. Most recent part I've replaced is the fuel vapor separator hose. (Was cracked and warped)

I feel like such an R tard when my vic stalls in traffic. They're supposed to be reliable. I'm determined to return it to bulletproof status.