Sounds good. In that case, warm up the car in your garage, pumping the accelerator as required for the first minute or 2, get it warm so it idles perfectly, then do a snap throttle test - dip the accelerator quickly and let go quickly (no more than one second in total) and check how the engine responds. You will dip it quick enough not to rev the hell out of it, that’s not the aim. The aim is to check the engine responds instantly and without hesitation (deviation or repetition 😀). It shouldn’t really get over 2000 rpm.

And if it performs exactly as normal, back onto the drive and check it pulls forwards, and then with that confidence take it round the block. And if it still performs perfectly, I think you can confidently go and order a new coolant temperature sensor. But if you do have a separate temp sensor for the dashboard (which probably only has a single wire), make sure you order the correct 2-wire sensor that goes to the ECU.

But if it doesn’t work as I’ve described, and it still plays up even when warm/hot, please come back and expand on it.

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