Jody.... The engine wants to run, no backfiring out the exhaust. It just doesn't run very long. I've had a couple runs that lasted 4-6 seconds. I've not tried to advance the throttle on a couple of 4-6 second runs and also tried to slowly advance the throttle both with the same result, just quits. RE the other comment, yes the crush washer was flattened, I was careful not to over tighten the plug, didn't want to strip it out, and the plug cap is very tight. I have to really push it on until it "pops" onto the end of the plug so I know it's on tight, and the spring is in place. I don't know anyone in my area that might have a DL to check the CID module with. I'm hoping the NGK plug(s) will solve the problem. I'm just going to chill until Mon when they arrive from TBM. I even looked to make sure the clunk is in the bottom of the tank. and that the vent line is clear. By the way I did purchase my DL-55 from Valley View about 6-8 weeks ago. Mike