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Hello and good evening everybody, i have a 5.7 hemi that i have bored over and stroked out to 397ci. i am having an issue with getting it to start properly and tuned, i have reset the timing already as it may have been done wrong at first only a bit off, however the changes made to the tune apparently the fueling isn't changing at all even though it is being changed in the tune. currently it will start rough idle at 1200rpms then drop off after 10 seconds to 650 then around 350 and die out then has troubles starting. we have tried different injectors as well and it hasnt changed anything. could it be a bad vac leak? or maybe bad spark coils. i am currently stumped any thoughts would be helpful,

I should add I do have 60psi fuel pressure..

Thanks.
 
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