To be honest, it seems to be that you have a bad ground or a "shorted out circuit" somewhere. Have you checked for any blown fuses? Is it judt the neddle pulsing or is the motor itself pulsing?

Anyway, go to a junkyard. I just saw 2 96-98 civics at Pick-N-Pull 3 days ago. The motor harness was still there. Price, it cant be more than $50.