Could be a few things. Did you check to make sure the MAF is clean, plugged in or or didn't accidentally break a wire? Have you changed the fuel filter and run some cleaner through the gas? Could be dirty there. It also wouldn't hurt to check the fuel pressure. I'm not sure how you would check it, but maybe the DPFE sensor is bad. I know you said you can't find a vacuum leak, but if it's not any of those, there might be a line cracked that you can't see enough to spray. There is a hidden hose under the manifold that you might have no sprayed. I recommend checking out this post

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Project log

99 Ford Ranger XLT Sport 3.0L
Autobot name:Rubeo Bestia(latin for little red beast)
135 amp alternator, 4.0 air intake tube, air box mod, 235/75-15 Hankook Dynapro, 01-03 conversion, buggman LEDs, throttle cable mod
I take photos for fun