For about a month, Freel drove like gold, without a single stutter or crankiness (almost 700 km), but then he limped again. decided to go all-in and replace all the solenoids. It ain't cheap ( the solenoids themselves cost $450 For their replacement, all workshops (as agreed) asked for 4000 UAH (£85) I believe that this is too much for unskilled labor and undertook to replace them myself. Until the night overtook me, I managed to remove the hydroblock, one by one, so as not to confuse the solenoids and the screws with which they are attached, replace the solenoids and install the hydroblock in place. All that remains for tomorrow is to install the pan, fill in new oil, connect everything and test drive. I hope that the problem was in the solenoids...