lawn boy silver series 10324 This mower will start and run for 5 min then die. I cannot restart it and must wait a couple of hours then it starts again. When it dies it just stops, no surging. I have replaced the gas cap, the needle valve and seat. Cleaned the gas tank, new gas line, new primer line, cleaned all jets with a torch needle kit or small wire, reset the coil clearance to .01 inch. No change in mower. Do the coils ever fail intermittently?