[Retro]

Hi yall, just took my furnace apart and cleaned the burner etc. I sprayed some lubricant on the intake side of the fan to lube it up too. 
Ive had it running here for a while and its fluttering, kindof snuffing out and relighting itself. Thought maybe was just vapors from the lubricant but it doesn't seem to be improving. Any ideas what it could be without doing a bunch of searching the forums?
Much appreciate any input