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I think I would start by running a couple of bottles of injector cleaner through it. You might also want to check fuel pump pressure to see if the fuel pump may be weak. A fuel filter is also a possibility although it may be one of the in the fuel tank types. Check the frame rail on the drivers side to see if your fuel pump is external to the tank.

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Q: You have a 1997 Chevy pickup 4.3 its hard to start at first once starts has a rough idle at 12 to 1500 rpm once it warms up it runs great you have done the basics plugs wire distributor rotar?
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