dakota cold start issue

My 2000 Dakota just started having this problem last week. When it sits for 6-8 hours it won't start. Turns over great spits a few times but won't fire
up. I remove the air cover and put some gas in the throttle body butterfly and it starts right up and runs great, you then can drive it shut it off and it starts right backup until it sits for 6-8 hours. I thought for sure it was the fuel pump and filter so I changed the unit and it started right up sat all day and the next day I got the same thing. I show no check engine light. Any help would be great. Thanks Greg

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