Thanks John, you and I think exactly alike. I let it get thru the stall then moved to the oven.
Well, no, the new parts didn't fix the temp swings, ha ha, I had my doubts but it was a warranty thing so had nothing to lose. It would hold just fine for about 20 minutes, then would jump to 280 and drop back down slowly to 230-240, then stabilize around 240 (it was set for 225). Sometimes would drop down to 210 for a while then hold. I think it is just the fixed timed function that these controllers use, there is no feedback to the controller and if there is, it doesn't seem to react to it. I know the variations aren't critical to a good smoke as they average out to a reasonable temp, but it does make one wonder....There are PIDs for these and I tried incorporating one into this but it was damn difficult to tune and I gave up (for now). Maybe Ardunio to the rescue.
Cheers