[kangeroo]

When I first start my Hyundai i30 in the morning it idles rough for the first few seconds. After revving slightly it disappears and operates normally it is a2016 model only done 35000KHM 

[Dazzler]

Hi,

I moved this to Problems with Petrol Model. I had to search your previous posts to find out what you had. I would certainly help for future inquiries if you put put a bit more detail in your car description/signature.

[kangeroo]

sorry I am 70 don't
 no much about the engine size etc

[Dazzler]

sorry I am 70 don't
 no much about the engine size etc

No probs I'm guessing it is the 1.8 litre unless it is a 2016 SR which had a 2.0 litre motor.

Hopefully someone technical will be along shortly with some ideas.

One of our Tech heads is actually as old or older than you! @nzenigma 

[nzenigma]

Great intro Dazz 

There are a number of things that come to mind.
These are trouble free cars so Im guessing maintenance issues.

If rough idle sounds like just one cylinder constantly  missing, you could have a lazy injector, or more likely poor spark plug. Among other things.

Rough idle in general could indicate an air leak, but my choice  as the most likely at 35,000km is a dirty MAF sensor. Can be cleaned with a spray cleaner.

[Dazzler]

No worries Gary. 

Thanks for your input. Much appreciated as usual.