That is your problem mate. The plugs will be sooted up now so they will need changing. I know it is a 205 block, but that engine is sweet as a nut. Since I had that issue it needed setting up. You could feel it was not pulling as well. Still went like fook but not as.well as it did. That car really shifts when you get her setup. Quickest car I have been in and alot of people I knew with experience of supercars said it would give some a run for their money