It runs but it doesnt quite run, you have accepted the fact a rebuild is on the cards so id be scouring the internet for witches brews for freeing up stuck seals and doing semi scientific tests then if all else fails what would billy hol do
My 1zz corolla did similar things and it was a cooked coilpack which was from a cooked from a leaky rocket cover gasket. Do some testing with 1 unplugged at a time and it should show which one is bad
Id believe that, my trump 2000 paddock basher turned the spider gears into liquid with one clutch kick on grass.
The mig fixed it real good but thats not really good for a road car