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what engine do you have?
the EWS is the alarm module that tells the engine to crank or not to crank... in super simplified terms... not sure if this is your case though...
if yours is a I-6, there might be an issue with the Idle Control Valve (ICV) - back in the old day a temporary remedy was, to rev the engine to the RED line a couple of times and the engine would idle fine for a week or two... ultimately, the ICV would need to be replaced...
Naturally, if you have a V8 - i am not sure what can cause this...
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