engine cranks but wont start on 2005 Chevrolet Cobalt

I replaced the spark plugs,checked the fule lines and filters but still it won't start,could it be my timing chain or something eles?

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2 answers
i would hook it up to a scantool to see if you get any codes it could be a bad sensor cam or crankshaft sensors or a parking neutral switch also a security light issue which is related to programing
try ignition coil