Is it one injector giving you a problem or all?
It's called a main fuel relay or main relay for short. The relay is under the cruise control module under the driver's dash. If you look up under the driver's dash you'll see a metal box and it should say cruise module. You have to remove three 10mm bolts and unplug the connector to the box and you can remove it. Under the box is the main relay. It's held in by one 10mm bolt.
Let me know if you need more help. I can get you pictures by I'd have to take them...
Here's the picture out of the service manual,
Ok no problem,
Main relays always fail intermittantly so the old one may work if you reinstalled it. It's not uncommon. It's the solder joints on the inside of the circuit board. They crack and the circuit goes open. You can tap the relay housing and get it to start usually but it's better to replace it to ensure the car is reliable.
If you have an engine miss let it run and pull one spark plug wire at a time and see what happens. If you pull a plug wire on a good cylinder that's not missing the engine will slow down. If you pull a plug and nothing happens that's your problem cylinder.
Let me know
Ok then the 1 and 2 cylinder aren't making power. Next you want to do a compression test in those cylinders. You may need a valve adjustment on those two cylinders, you may have two bad injectors. It's hard to say BUT you are one step ahead so don't get discouraged.