MisFiring Galant 2.0 GTI 4X4 1990
 

Hi all, i posted this problem before, basically when my car has been running for around 100 miles or so i start to smell petrol, it starts to mis fire, buck, cut out and grey smoke comes out the back! this happened almost imediately in the summer when the car had been left in the sun all day.
I have replaced the fuel filter, used injector cleaner, replaced the ignition amplifier, replaced the coil packs, replaced the ecu, rewired the fuel pump. i get no check engine warning light and if you let the car cool off a little you can get a few more miles out of it before it happens again. Obviously something failing under high temp, any ideas anyone please.
Cheers