i replaced my ignition switch and that fixed the key problem. now once i plugged my sparkplug wires back in and turned the car on, it started to make a hollow popping backfire at idle. it does it randomly while the car is idling.. i cant find any pattern to it...

also i have a loss in performance and the car feels like its running on 7 cylinders.. i believe this has something to do with my coil or optispark since the ground wire on the coil bolt fell off and i just replaced my optispark.. any suggestions?

 

I had this same problem today, it happens after I've been driving for a long time