Heres the basics, After putting cheap gas in it I have very rough idle in all gears at about 700- 2000 rpms.Low power on the freeway (I have to drive it) I have put an injection cleaner in the tank as well as a full tank of 92 octane, hoping it would clear but after driving about 15 miles on the freeway, it didn't. Three questions: Is it a fuel injectior ? Can I look at the spark plugs and determine which one is bad? Something else? Thank you Rojo