Yeah, you got that right Mike. I had two calls this season for short cycling on Colemans. One was a 2000 but both had techs out to check them out and one replaced the HSI, control valve and flame sensor. Finally gave up and blamed the problem on gas pressure problems. Told the customer to call the utility company, thats where I came in and found a spider web in the orfice. I fired it and right away knew the orfice was restricted. The flame wasn't big enough to come in contact with the flame rod. The tech had to have taken the orfice out to change the valve and missed it. The other was a no heat complaint, same senerio. I don't know how those damn things get in there but the do. Not saying this is the problem, but it's a condition to be checked.
See you soon Mike!