Thanks Jkm311!I will read the thread immediately...I'll keep you all in touch with any development.Ciao!

Thank Raven! I'll see if I can have a hand on this product. By the way, whille trying to find some information about Techron fuel treatment, I remembered that I commonly use regular fuel onmy Vibe GT. I always did that since fuel price rise in 2005. I will make a try before to buy any fuel treatment...

Thank you for replying.Yes, I use K&N oil filter. Never heard about dirty MAF sensor before. I'll have a look on this soon.Is it a normal problem that should occurs often with this type of air filter?

Good afternoon,I experienced some misfires during a constant speed trip today. It is strange, because it never happened before. This occured also two to three days ago. As an example, on a 70 miles long trip, engine did some misfires (3 or 4). It is winter at this time. First experience was at 0 deg...