It appears that the issue is solved !!!!!! I was feeling I could be out of my depth and so I did some asking around locally to try and find a better than average car guy with electrical/control stuff. The new guy he was able to pin-point the issue to the "NEW" coil on plug that I had put i...

Thanks Jolt and Caretaker. You've both given me more to consider. I hope to have time to look at things soon, but I got other burgers on the front burner at the moment that are starting to smoke! Luckily I have loaner wheels for now so I don't have to drive the currently troubled Matrix. My first st...

Thanks for the feedback. I agree with you. Plugs and ignition coils don't last forever and they degrade with time. Who here will be shocked to hear me say that I still have the original plugs and coils !!!! That's almost true. A year ago I had a single coil go bad. When that failed it was a non-stop...

Hello everyone. I've had this 2005 Matrix since 2007 and it's been fantastic (240,000km), but now I have my first head scratcher. I hope someone here has a few ideas. Intermittently while driving the engine will go rough for a few seconds, maybe even as long as half a minute and then go back to norm...