You've got a lot of checking to do my friend. If you don't know much about electronics I would take it to a garage but here's what I can give you:
1.) Check all the spark plug wires for cracked/missing wire insulation and anywhere they could be shorted out.
2.) Check under the dash by the ignition module for the same. If you have installed any kind of alarm/remote start system than your problem could very well be here.
3.) Have your ignition coil checked at an auto parts store. I think most of them will do that for you.
4.) If you have a good bit of electronics knowledge and you really want to tackle this yourself it would help to pick up a repair manual for your car and have a look at the ignition circuit schematic in the manual. This should give you a better idea of how it's wired and where they problem may be.