97 dodge dakota 3.9 won't start?

comon sence

New member
Driving 1 day and it just cut off changed. the fuel pump,mapp sensor,ECM,and crank position sensor starts but shuts down after about 3 seconds or so. timing is in right place & getting fuel & fire ground cables are tight battery is fully charged. Crate engine has about 50,000 on it. Does any one know what could be causing this?
Had a tune up just a week before it stopped. this model doesn't have a cam sensor. According to the parts store. they had no listing for a cam sensor. When I could get a code it said mapp sensor. fuel pressure regulator is all in 1 unit with fuel pump. the new ECM and the disconnecting of the battery prevents a code from coming up so I'm told. the check engine light never came on
 
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