I agree. If the oil dipstick is jumping out of the tube, and you've cleaned the flame trap and tubes, you've accomplished half the job. The other half of the cleaning operation will require you to remove the Oil Trap (breather box, oil separator) and dig out the hardened/dried oil with a screwdriver. There's a comprehensive post on this issue at the following link: http://www.brickboard.com/RWD/index.htm?id=1043765 This post was written for a Turbo car, which does not have a flame trap, but does indeed have the same Oil Trap bolted to the block.
Contrary to what some have said, it is possible to get the box out without removing the intake-- you will need some extensions and a universal or wobble socket. Two 12mm bolts and a smaller (10mm?) bolt holding the wiring harness to the top of the box.
I will concur that you can remove the Oil Trap without removing the intake manifold. However, your hands will get scraped up if you aren't wearing mechanics gloves. Look closely at the pictures of the Oil Trap in the above link so you know how to get at the two 12mm or 13mm bolts (depends on the year) that hold it down. Also, if you have an '89 or later non-turbo car, or a 1990 or later Turbo car, there is a small bolt at the top of the Oil Trap that holds a wiring harness tether in place (since the engine harness passes right over top of it on the LH-2.4 cars). It will either be an 8mm or a 10mm and shouldn't be too hard to get off.
With some practice, you'll be able to get this entire operation down to less than an hour (comprehensive cleaning of the Oil Trap, Flame Trap, and all associated tubes).
God bless,
Fitz Fitzgerald.
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'87 Blue 240 Wagon, 268k miles.
'88 Black 780, PRV-6, 149k miles.
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