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did you check and clean the air flow meter ,the crankcase breather the idle control valve then the crank shaft sensor ,turn the key do not start it ,take off the fuel cap now can you hear the fuel pump turning ,if no then change the fuel pump relay details found on goggle on were the relay is cost about 20 USD in the UK about £18.

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Q: Why would a 91 deville not start even after removing and cleaning EGR valve and throttle body?
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