I've just changed the spark plugs

Go was running before you change the spark plugs and you need to look for wire connections and make sure they're not unplug by accident

Hi there, Sometimes they can seem like they are tight, but the terminal inside the spark plug boot is to the side of the spark plug. Also, dielectric grease needs to be used on both ends of the spark plug wires, and the spark plug wires must be on the proper spark plug. There are diagrams around the internet if you forgot to mark the correct spark plug wire for the correct spark plug position. Lastly, you have to ensure the spark plugs are gaped properly. On the catalyst information sticker at the front of the engine bay, you will see the spark plug gap measurement. The tool to set them is a little circular tool that costs .99. You also may have the wrong spark plugs.