[Mustangman25]

I would find a way to get the code read...usually will give you a very good idea of where to look. Try Pepboys; I'm pretty sure that they'll scan your comp for a good price. I've heard of many different causes for this in the Zetec...you should try the simple stuff first. You did plugs and wires, make sure that your air filter is clean, MAF sensor is clean, fuel filter is ok. If those check out, then a common solution is a new ignition coil, also something called a DPFE sensor, but to tell you the truth, I have no clue how that sensor affects the engine's performance, all I know is that many engines with symptons exactly like yours have had their problems fixed by having that replaced. Check with your Ford dealer, as the part is supposed to have an extended warrenty.