Just fitted the 3 timing belts to a kia carnival.
Did the front belt first and reassembled. Started
engine and all was fine.
After I fitted the rear belts it developed a rough idle.
I assumed it was from a cam being out of time.
I didnt use the marks given coz its hard to understand
so I used a pointer on one cam each bank and made
my own mark on the other cams.
All marks seem to line up so im at a loss
I would start with checking the cam timing again, the rear cam is the hardest to see, I have sen these one tooth out ensure that this is correct first. Use the factory timing marks as your guide as well.