97 Sable wont start

97 Sable sometimes just doesn't want to start, lots of fuel at the Schrader valve and pump is working. Here's the weird thing , this car has had 3 crankshaft position sensors in it the last being only about 2 months ago.
Immediately after you replace the c.p.s. the car starts right up. Today it wouldn't start and we gave it a shot of quick start down the intake hose and it fired right up and has started all day long ever since. Any Ideas what the root of this could be? Sensors are always factory Ford.
Tanks in advance, Dave.
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Sorry forgot to mention 3.0 Duratech DOHC engine 140k on it

Schrader
and
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