I'm sure I've read that there's a procedure you need to go through to reset the TPS. Will see if I can find it.

All I could find was a post on XPF, and it may not work on 180s. But I won't cost you owt to try. I'd also try to eliminate your throttle cable isn't sticking. Also I have a spare IACV gasket if your stuck (for cost). I've cleaned my IACV before and reusing the gasket is not advisable.

"Try reseting the throttle closed position by turning ign on to 2, pump the pedal 5 times, then start without any throttle after 5 secs".

There is for the 4 cylinder cars but it doesn't work on the KV6.

Ignition to position 2, fully depress and release the accelerator peddle 5 times and wait until the stepper motor stops adjusting, then start the car.

TPS might need resetting on a computer, most cars with TPS need it to be reset so the ECU knows where the start and finish is

Personally I wouldn't spray a flammable gas around the engine, WD40 works quite well. What you'd have to do is drive the car until the revs, stick, roll into a layby, pop the bonnet and spray the WD40 around until the revs drop, after a little while I'd expect the WD40 gets sucked through and the revs pick up again.

Worked alright for my ZR haha!
Would probably work with deodorant too!

It's worth resetting the TPS as per Talking cars procedure. Also check the throttle cable isn't sticking.

Also it only does it when engines warm

I've just got it on video I'll upload later on