starter issues on 1997 Chevrolet 3500 Pickup

when i hook the battery up and turn the key on to the RUN position the starter engages. had starter tested is fine. installed new ignition switch still the same. what could be causing this?

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2 answers 2 comments
Wire or relay problem. What happens if you turn the key to 'crank' position? Test starter relay. Will it run , but starter keeps cranking?
the problem was the nuetral safety switch on transmission. changed that and everything is fine. thank you for your help.
Good deal! Thanks for the response , glad it's fixed.
possible fuel delivery issues. check fuel pump.