08 Grand Prix gxp not starting

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Pontiac21

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I have a 08 Grand Prix gxp that wont start, it has a brand new battery, the alternator is fine, it cranks and randomly will turnover but then immediately will shut down, it also has brand new spark plugs, there is a reduced engine power light that is on, i have hooked a computer up to it and the code is p1682, i could really use some help, thanx a lot for reading
 
I have checked all of the fuses and looked all over for shorts or loose connections but all seems ok, is there any way to test the ECM?
 
only with a expensive scan tool, techII, etc.
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If ignition switch is bad would car still crank? And can autozone, advanced etc be able to test the ECM if i took it out of my car?
 
have you tested the tested/swapped the relay mentioned in the link? You would have to check with the stores to determine what they can do.
 
Now im really confused just went out to my car and it cranked right up and started, i took it for a little test drive because check engine light is still on and once i get up to about 15-20 it isnt smooth, the rpms just keep jumping and so is the car, any ideas?
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recheck the code from the computer and I was talking about relays not fuses
 
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