Hi everyone.

Been a 3 wheeler for just over a year and 3,000 happy miles but find myself in need of your combined knowledge.

My car is 2018 with a stage 2 upgrade. It has been back with KH for a month trying to resolve a misfire when cold. It clears once warm, but until then has a severe hesitation when driving gently or on half throttle. Give it full gas and it pulls through, albeit not cleanly. Not sure the neighbours or local constabulary would understand. It is bad enough to start looking for somewhere to pull over but hasn't fully failed on me yet.

The problem hasn't always been there but has come on over the last 500 or so miles.

To date it has had several ECU's trialled along with every sensor replaced one by one - but still the problem is there. Sensors, plugs, leads, exhaust sensors, cats - pretty much everything electrical or fuelling but still it persists.

Convinced the problem is not mechanical as it clears once warm, the problem is getting it warm.

Next option is a full engine harness change but before then thought I would reach out to all the experience here to see if anyone had any suggestions or experience of a similar issue? KH determined to resolve but a harness change is a big job apparently.

Any ideas? Any known places where the harness may chafe and short out a key sensor?

I just want my baby back! The space in my garage is filling up with rubbish!