Sorry it has been a while, but been pretty busy. lnesomdove I tried the spark arrestor cleaning prior to me changing the spark plug and air filter, and no dice. Now I also put some Mystery Oil in the fuel (just an ounce or 2) prior to taking it to Stephens, but it did not seem to make a difference. After I posted this, I went and picked up my trimmer from Stephens. By the way they had no remorse, excuses, or really anything to say other than here is your trimmer. I took it home and cleaned up around the fuel lines and primer using carb cleaner and my air compressor. I also tightened the 4 screws around the primer. I did this so I could run it at 3/4 and full throttle and look for fuel leaks. Keep in mind Stephens haven't even touched the thing so I don't know if the Mystery Oil did the trick or tightening the screws did the trick. It started and ran at full throttle with no problems. Anyways it runs fine now and I have used it for at least 12 hrs or more since.