Furnace kicks in; flame ignites runs 30 seconds or so then shuts down; 10 seconds later fan kicks in dumps warm air then shuts down; is this a cad cell problem?

Is this a waste oil furnace? I have installed a few of these.
Take the burner out, and CLEAN EVERYTHING. Turn all power off to the unit and clean everything. It could be the CAD but it's more than likely dirty. Also check the chimney flue... if anything is leaking or blocking it, the furnace will not run. Good Luck

Not a waste oil furnace, this an older model intertherm oil furnace model #MSH 080 AA (hard to read) that has only run on arctic stove oil. I change line filters (2) and nozzle. Bled the line and restarted furnace, this has always worked in the past.