94. Think I created a problem. loud clicking

I am working on a car that friend got for free. The car would start and run sometimes, but not all the time. (Replaced the crankshaft pos. Sensor and jumped it. Started right up.) The owners before had changed the coil-pack and it was from a minivan. Thinking that was part of the problem (Before replacing the sensor) I replaced it with the old one. And I think I messed up the firing order. Can anyone help me get it right?