hi all my name is luke and i have owned my octavia for four years. it has 130k on it and had a engine rebuild. at times when i start the car bit is very hard and rough but at other times it is smooth and ok

any suggestions on this matter?

thanks luke

Temp sender, maybe sending wonky signals down the line to ecu

i.e. it's thinks it's hot when cold starting so doesn't add enough fuel

If it's shaking so bad that it feels like it's running on three cylinders, then you may have a bad injector.