[compdoc777]

I build and work on motors a little more advanced than the Ecotecs so let me put my two cents in here.

That scenario does not make sense in this motor. Yes there is a problem, and no plug wires is not it. These cars have coil packs not plug wires. If one was loose it would have been removed and re-inserted into the shaft and thus solved the problem, but the only problem with that is these coil packs are bolted down to the motor. So getting loose would not happen.

Depending if it is just one spark plug that is being affected then you may have a bad coil pack or igniter same thing. Each cylinder is an individual igniter or coil pack.

Now you may be facing something different could be a wiring problem from the ECU to the engine causing the it to misfire by grounding out to the body somewhere on the chassis and this is very hard to find. As I am going through a simular problem at the moment.

It could be caused by improper fuel from an injector or wiring to that injector or even a valve related issue.

I would suggest you take it to a dealer that will put a little more effort into the problem like that, because yes it is a symptom of a bigger problem and one that can cause a serious failure.

Also call and report the dealer that told you that the spark plus was bad and idling rough is normal to Saturn Corporate.