Okay, your description is confusing. :Spraying fuel down the throttle body made it fire for a minute? That's a fuel problem. Having a lite pulse on the injectors doesn't mean they are working. That pulse is only one of 3 signals needed. WHY did you replace the MAP? Did it blow a code or something? It can effect fuel delivery, but not stop it. Check the connections on it anyway, and make sure the vacuum line is installed correctly at both ends. Doesn't hurt to check your own work.
Just for grins, before you get into this fuel stuff, for your peace of mind pull 1 plug (number 3 is about the easiest), Put the wire on it and ground it. Make sure it's sparking. That should check out okay. If not, you can address it from there.
I have seen fuel pumps and fuel filters do stupid stuff on TPI motors. Did you check the fuel pressure with the engine cranking or just the key on?
I've had 2 or 3 fuel pumps fail on me. they will run, shut down all of a sudden, then fire back up later as if nothing is wrong. They are a pain in the petute to change, as you have to drop the tank, which means the exhaust has to be unbolted and lowered, along with the rear end.
If the filter is plugged, it can supply pressure with just the key, but won't let enough fuel through to make the engine run. Check the fuel pressure while someone is cranking the engine over for you. It might drop almost to 0. If that's the case, go from there. It'll likely be fuel pump or filter.
If the pump and filter check out, and there is no check engine lite codes, then about all that's left is the ECM or a broken wire/plug at the ECM. Injectors don't all go out at once. You will invariably come up with a miss on one cylinder. They are independant as the spark plugs, I don't even think they CAN effect each other.
The ECM is located up under the passenger side dash. Remove the lower dash cover (down by where your feet are) push the seat back and lower the back till you have enough room. Then if you lay on your back and look up you will see it. It's a silver box with 5 or 6 plugs in it. You will have to unscrew one or 2 bolts to get it out.
Check for pins that have backed out of the plugs and for broken wires (they can snap off right at the connector). Unplug all the plugs (you will have to first remove some comb locks - look and you will see what I mean on that). When all the plugs are loose, drag the computer out where you can see it and check all the pins. Look for rust or nasty dirty pins.
Put the ECM on the work bench and remove the top cover. DO NOT stick your fingers in there because static from your hands can damage the chips. Look for burn marks or discolored/swollen components. If you can't see anything wrong, put the cover back on it. Put DIELECTRIC GREASE on the male pins, and replug it in. Don't install it up under the dash. See if your lubing and reseating plugs fixed it. If not, If not, you can look up automotive ECM testing in your area and take it to someone with the test eq to make sure it's alright.
NOTE TO SAVE A LITTLE MONEY: If you call a good parts house and give them the part number of the ECM, they should be able to tell you what year cars it fits. Take the list and hit the junk yards.
Good luck, and you can PM me if you want.
Dig