I have a 96 Nissan Maxima

Did you replace the camshaft sensor ?

thats fine.....do u thing i need to check the ignition switch

First you have to determine whether or the reason it is not starting is because not getting fuel or fire. Spray some starting fluid into throttle if it starts then shuts back off it is not getting fire if no start at all when sprayed then not getting fire.

ok i will try that thanks .......ill post a update later