Im having a slight missfire when the engine is hot (normal operating temp) it happens at 1100k revs but other than that its fine. Revs all the way. I fitted new timing chains and guides before fitting the engine in. I have new sparkies waiting at home to be fitted toms morning. So my next thing is to fill the tank up with some v power juice (like i have been) so next question is redex, wynns fuel cleaner or does anyone have another one thats does a better job?