99 tahoe missing badley when accelerating. popping code p 303

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Lucasswain

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May 28, 2013
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Spokane,WA
so I need some help. I have lifted Tahoe 5.7 liter Vortec. I'm having some issues with the engine missing. and the code is reading P 3 O 3. when driving up the hill it starts mission really bad and check engine light starts flashing. it also misses really bad when excellerating on the freeway. it also has this weird delayed start world turnover bunch of times before starting. I'm wondering if is it my spider injectors or what could be¿ hey buddy has any advice please let me know.
 

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