Idle jets are my guess also,if 44's are in the same position as 40's ,on the side ,
they unscrew ,you just blow them out ,replace and that should correct the
problem. If it does I would wonder where the crap that pluged them came from?
Maybe a change in fuel filter is in order. The jets have a very small opening and
plug easly. Good luck keep us posted Dave

Edit: I agree on 44's being to big for a 1.7, i have a 1.7 with 40's and love them.