i had the same problem for 2 years

tryed the tourque sleeve changed filter fuel pipes still the same

then my sisters cargo played up and that solved it for me

sisters cargo lost power so i changed the filter ect still the same

it was a cable stop solonide and the cable had slipped ie not holding the stop of completely. so i checked my voltage at mine and that was ok

so i changed it and geuse what

it flew the best it ever had. so i recon the solon9ide had got week. and to prove it i changed it back a mounth later and the symptons return till i binned it fitted another soliniod