Misfire / Rough Idle

[Toyobrob31]

Ive had the same problem on my 2007 aveo and the car had ngk copper plugs in it and these engines dont run well on copper plugs so i put in ac delco platinum plugs part number 41-801and now it runs absolutely perfect i also think autolite double platinums would have worked as well part number app3923...problem fixed

[avguy]

Ive had the same problem on my 2007 aveo and the car had ngk copper plugs in it and these engines dont run well on copper plugs so i put in ac delco platinum plugs part number 41-801and now it runs absolutely perfect i also think autolite double platinums would have worked as well part number app3923...problem fixed

You're entitled to express your opinion, but the experience of many here (including me) is that copper plugs run just fine. Can't tell you what the problem with yours was (or still is), but IMO it was not the fact that the previous plugs were copper.