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So after receiving trouble codes after my tune on VP X98 racing fuel, I received cylinder 1 misfire and random/multiple cylinder misfire. So I changed all my fuel injectors, and now reviewing codes cylinder 1 misfire, cylinder 2 misfire, random/multiple cylinder misfire, and fuel rail/system pressure too low. What gives?
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Misfires could be your spark plugs. Also, are they larger injectors, or OEM sized? Low fuel pressure is likely the fuel pump.
 

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Did you upgrade your fuel pump? I'm thinking maybe your fuel pump isn't keeping up regardless of the injectors you are using.
 

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With all those codes, I would say you have an electrical problem. TPMS, airbags, and misfires? Could be the battery. Have the battery and Alt load tested.
 
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