1994 Buick Park Avenue neutral switch problem

T00THL3SS

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Hi there I have a problem with my car it first called out a trouble code of P0705 and P1406. I replaced the egr valve since it was easier, but it didn't fix the service engine soon light. I also replaced the "neutral position switch" becuase my car starts up just fine but when I put it in any gear it doesn't move forward. After replacing both of these parts it didnt fix anything. Is there any advice someone cam give me ?!
 
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