slight miss

[IGNIS SPORT]

I Have a little miss in my IS at idle ,not all the time mostly when you come back down from highway speed.Wondering if the o2 sensor might of finally had it.Plugs n leads changed only 20,000ks ago(IRIDUM plugs,topgun leads)Just started this miss last week or so.Have run two tanks of fuel from two diffrent garages I doult its fuel issues.Cars done 110,000ks.Outside of that every thing else is fine.Ideas?

[[YLD80Y]]

Could be one of two dozen things. Start with the simple things like sensors, HT leads, filters and then go onto the less obvious (and more difficult) things.

[chill]

Try to clean your throttle body and reset your ECU.
This help in my case.

[IGNIS SPORT]

Its been a few months and this miss has returned after going away.Noticed that its drops the rev (600 rpm) when coming back to idle then goes back to normal idle (800 rpm) . But is not doing it every time. Any ideas

[redgtimk2]

strange enough my 05 does the same thing i just changed plugs and clean the TB also i noticed the engine shudders alot when i send up the windows at idle ne ideas (jus changed as in 2 weeks ago)

[chill]

Better clean up the throttle body and check the air filter.
Most of the time, thats the culprit.

[IGNIS SPORT]

Fixed,battery craped it in.Replaced, Things going better then ever.

[pHr34kY]

Hmm.. Mine's also being strange. Every know and then it appears to drop to 3 cylinders, usually after slowing down for a school zone or a red light. It only does it for a few seconds or so if rolling, and just stalls if idle. Once it came back with a loud 'pop' through the exhaust, which I guess indicated that the cylinder was likely filling with fuel (spark problem, not injetcors?).

Battery is only a few months old. Changed the plugs (figured after 99,000km they'd be done), but no luck. It was running poorly for a week after I degreased the engine bay, but it's been fine for a month or two since then, and this feels a little different.

I'll do the obvious stuff and check the electrical connections first. I might end up waiting until it fails properly so I can diagnose it.