I have a 2007 Holden with a 2.0 Turbo engine. On one day I decided to go through a light that had just turned orange- so I pressed down, not completely as I new how much power I needed to go through the intersection. Surprisingly very little power was produced, as if I was two gears higher than I should be. Then I noticed the power (the little it was producing) was not smooth- the engine was shaky. Next thing I noticed the engine sign was flashing. So I parked for a few minutes checking the engine area which looked fine. Started the car again and engine sign was gone. Now I feel the shaking only when I try to accelerate faster that normal, the shaking is very light. What could be wrong with the vehicle? And yes I am taking it for a checkup in a few days.
I would have checked the plugs and coil(s), but looks like you already found that answer.
Same thing happened to me. all of a sudden, less power and engine vibration. Like the car did not want to go into third gear. When i went over 60 kms/hour the engine light came on. Straight to my mechanic, he only found the problem next day when the car did not even start. Basically a wet battery too low on water. Only cost me a dollar and the car has been fine since. Hope this info might help somebody someday.