Hi, My ZDZ 80 on its 1st run up was perfect idle. 2nd days run, It would idle down to approx. 1500, but slowly die out. I had to click it higher to keep it running, then it would be too fast. I then experimented with the low speed needle. I had to lean it out a bit. Now Im getting a consistant idle. I know these are two different types of engines, but could be your low speed is too rich. Not knowing your needle settings, thought Id add my 2 cents. Good luck!