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Sounds to me like the engine in fact is getting gas when idleing, but not getting enough air. Therefore my 2 cents are on you IACV (Idle Air Controller Valve). It's a small steel cylinder suspended in a rubber piece on the front of your throttle body, and its job is to supply the engine with air when idleing. This is a necessity since the throttle body valve is closed when the gas pedal isn't pressed. Take out the IACV and clean it thoroughly, also make sure that the air going from it is not hindered by any gunk or deposits on its way to the intake manifold. (You could have someone hold their hand on the IACV when you take your foot of the gas pedal. If nothing happens it's probably dead or stuck. If something does happen there is still a chance that the air is hindered somewhere).
for the cheapest TEMPORARY solution get some fuel injector cleaner and get on the gas fo about 5 mile at like 100 - 120 miles an hour thats what idid to mine last week hasnt wanted to die out since. good luck.
do a compression test as oil out the dip stick is usualy cauused by blowby or blocked engine breather. PCV.compression test will also pick up any problem with the head.when you pull the spark plugs out make sure they are the same color.
rx7`s should rev to 3000 when started cold then it should settle to 750 to 1000 after about 30 to 60 seconds. mine suffers a similar problem. so far I have been told various answers, mostly involving the bac valve, lambda sensor, air flow meter, etc. try starting of by adjusting the idle adjust screw (on top of the throttle body under plastic cover) this may be all it is. I have not had time to do mine. Its been fine otherwise and idles fine after a few minutes. mine is non turbo 87.