Jeep not starting

My jeep will not start at all. It ran fine around this time last year but slowly it started acting up almost like it was running out of gas. Then a few months ago I took it from ky to Iowa and stayed for about a week then the day I got back to ky it stalled out and died. And it sounded like it was running out of gas but it didnt. And so I put all new spark plugs in it but that didn't work and I took off my fuel line to see if it was getting fuel (it was) and it still didn't run so after it sat there a couple days I went to start it back up again but I messed with the cps on top of the distributor and it started. Then a couple days later it stopped running all together and I've since changed out the fuel pump cleaned the injectors changed the cps distributor and rotor and even cleaned out the map sensor. But I had the computer scanned and only found one code that popped up was p1491 and all my other readings were normal. I have no clue what is wrong with my jeep. Please help me.

 

You need to start eliminating some things. I know you stated you replaced the plugs but you do not indicate whether you checked to see if you are getting spark. You state you checked to see if fuel is flowing but did not indicate that you tested the fuel pressure. Are you getting a fuel smell when you crank it (flooding?) Is it cranking normally?

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