Well before anyone can help the first thing that needs to be done is to obtain the code that is stored in the PCM. Usually Autozone will do a free diagnostic check where they will retrive the code from the PCM. without that codes its basically a shot in the dark.

We can however cover the basics. Does the car run rough since you put the plugs in?

What brand plugs are they? Bosch.

Are all the plug wires snapped in tight. and in proper order?
or if it has coil packs (i can't remember) are they plugged in?