Hello
This is my 1st post on the Honda side, Sorry I only know German cars.

My GF has a 70s Classic mini with the Honda Vtec conversion. Its engine is from a 2000 Civic si. The car has been running great, the car really goes.

Last month it was rearended and it spent a few weeks at the shop getting the rear end replaced. The gas tank was also damaged and was replaced. The car has a aftermarket fuel pump, it was clear of the damaged area.
The car has been running well for 3 weeks then it died a few days ago. It had no power at all. I figured out the body shop repainted the inside of the trunk and the ground. So it lost ground. I fixed this and the car now will start right up.

When its cold it runs ok. you can drive the car, rev the engine ETC. Once it gets warm the idle get rough, but not to bad.
But when you try to rev the engineit stumbles. The engine will not rev up, If you try to give it gas the engine will stumble and stall out.

On the german cars the OX sensor will do this. You can unhook it and the car will go into a loopback mode and run ok. Will the Hondas do the same?

I also did a search and I see that the Temp sensor RE water temp could be at fault?
Is there any thing else I should look at.

Thanks.. Its the White mini..