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I have a 2012 Kia Forte ex 137km. When I start it up it is usually rough like the rpm will hesitate and go up then drop to about 500. Sometimes it will fluctuate and once it even went to 0 and stalled. But the car runs smooth it’s only rough on startups. Does anyone know what it can be because there are no check engine lights.
 

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2010 Kia Forte Koup SX 2.4L 6MT Theta 2, Titanium silver metallic.
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Hard to say without seeing it in person.

It can be a dirty, full of deposit throttle body, dirty fuel, dirty fuel injectors, weak battery, ignition coil/coil packs. Check your fuses & relays.

Check your hoses. One might be old, cracked or loose.

I bought a 2007 Toyota Scion TC 2.4L auto. It had a horrible awful hard starting, idling surging & fluctuating rpms. So bad that it went into limp mode. Checked the usual parts & replaced with new one. Found out it was a measly 10amp fuse. AIC (Air Idle control) fuse. Spent weeks trying to fix. Something so simple causing major problems.

Hope this helps. Let us know what was the fix. It helps out the community.

Anthony
 
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