Not likely cam timing of the problem comes and goes. What the guys say about sticky / worn ignition parts sounds likely.
Thought I would share the goofy situation I ran into on a relatives 302 Maverick.
He had that short lived aluminum / nylon cam sprocket that shed all the nylon and slipped the chain retarding the cam. He replaced the timing set and could hardly get it to run, hard to start and would stall at low rpm. I told him he had to have installed the new timing set 1 tooth retarded, because thats exactly how they run with late cam timing. He absolutly swore he had double checked it and the marks did line up. I thought "yeah right" and tore the front of the engine down in my shop. THE MARKS WERE LINED UP!!!, but something about that new cam sprocket looked odd. Normally on a SB Ford cam sprocket you can draw a line from the center of the sprocket, through the dowl pin to the mark on the edge of the sprocket. On this one, the line through the sprocket center and dowl hole missed the mark by 1 tooth !! The guy who drilled the dowl hole at the factory got it 1 tooth off in the drilling jig !!. Other than that, the sprocket was perfect, so after comparing another old Ford cam sprocket to make sure I was right about the cam,dowl pin and crank all being in the same line, I reinstalled the misdrilled new sprocket 1 tooth off from the indicated mark. It ran perfectly, ran that way until it wore the car out. Normally a guy doesn't think to look for crap like that, but it did happen, atleast once. :0)
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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