Hi all, need some help, was driving from work about 65mph when my Sportrak seemed to loose power. When I stopped the car had a bit of a misfire. So I replaced the plugs no change to the running, I then swapped the ht leads from my others Sportrak still no joy. I did a compression test it seems cylinder 4 has nearly no pressure 2 bar. The others are up to 9-10 bar. The car was running great before hand. Head gasket was done last year, with belts and clutch, I have no oil in the water or water in the oil, I did notice a bit of a chuffing sound tho when driving.
Any ideas before I start deciding if it's scrap or a new winter project for rebuild or engine swap

It's a1997 Sportrak with 117000 miles if that help