Look in the Big Green Book (BGB) manual p. FI 110
The relay is the round knobby looking one in the box near the battery
Its the one farthest from the strut tower. You should hear it click when you turn on the ignition.
The book has a way to test it if you have a multimeter.
The other round one is the injector relay which you can test.
The solenoid resistor also comes into play.
Look for damaged wires, plugs with rusty terminals and loose connectors and give looms a bit of a shake which might highlight a dodgy connection
Good Luck!