I recently purchased a 1987 rx7 and it ran good for a day, then just stopped running in the middle of the street and found it was the starter so I replaced it, started up perfectly. But the next day just stopped again. Spark plugs all spark, injectors are clear, fuel pump is pumping out of one of the two nozzles coming out of the top of it. When I turn the key all the pulleys turn but it only sounds like your trying to start a dead car but doesn't attempt to really start like the engine it's self if getting ready to start. So I replaced battery and alternator just thinking it was something with that and still nothing. It WAS over heating the previous day but coolant was full fan was blowing, I replaced the water pump (not thinking it'd help my car start just dying to fix the over heating).
ANY SORT OF ADVICE OR CONSTRUCTIVE FEEDBACK WOULD BE MUCH APPRECIATED

 

sounds like you've checked everything but compression, rent a tester and check that first

Is My Engine Blown?

 

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Will do thanks man