So I'm new to smoking and this was about my 4th smoke in my new smoker. Everything else was a great success. Bought a pork loin roast, boneless, and covered in rub. Let it sit overnight in fridge. Started smoke at around 1 o'clock. I use a smoke hollow gas smoker. I have a dual thermometer and was keeping the smoker temp in the 225 to 240 range the whole time. Used my amnps to generate smoke. IT temp shot up the first 2 hours like I would have expected but it stalled, which I read that it would, so i didnt get too excited. I let that crazy roast stay in there for over 6 hoursand the temp only got as high as 149. It was only about a 2.5 lbs roast so i was expecting only about 4 hours to finish. I checked my thermometers in boiling water and both were within 2 deg of being right on. I checked the meat when it was cooking with an alternate therm and it was within 2 deg also. Not sure what happened. Any help would be appreciated. I was feeling pretty good about my smoking abilities until this one. I got a little humble pie instead of a nice roast. It looked and smelled good when i pulled it out, but for safety I through it out.