Finally figured it out.

The Evo .36 I got in the raffle last Oct. has not been running like it should. I changed tanks several times to no avail. I found seepage near the mounting lugs while the engine was running and discovered there wasn't a gasket under the rear cover. I made one up but the engine ran the same. I re read the instructions and installed a smaller venturi and found what I was looking for the nitro percentage of the fuel 5 to 10% it says. I put in 2 ounces of 15% and it purred like a kitten. Nice and steady rpm. Now if it ever stops snowing and the temps get into the 40's and the winds calm a bit I'll be able to test fly it.