rose01

When running at idle and low rpm in traffic or pulling away, my thundercat runs rough, splutters and has little power. It happens when the throttle is just cracked open. Once through this and opened up its fine. I believe it started when i left it standing over winter ( I put it down to petrol gone off) I have cleaned out carbs, checked sync, changed plugs and checked for air leaks, all to no avail. Has anyone had similar problems? Is there anything else I could try?? Thanks - rosie