Ive check everything! plugs,wiring and fuses but still have no spark!!!! have anybody else had this problem before..... the only thing i did was switch back to the stock ecu from aem.......

 

You could have possibly fried the ecu by electrical shock common from static electricity off your clothes and most commonly from the carpet/floor mats in the car.

And or possible from leaving the ignition or battery connected when plugging the ecu in.

 

Does your car crank? light, radio and other stuff work?