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99hocamaro

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  1. 99hocamaro
    Background. 2018 Silverado was cammed only. Since then i have pulled the engine done the following mods: GPI Drop in Pistons CID cylinder heads LT4 Injectors and HPFP 535 In tank pump Procharger D1sc. Issue: Truck ran good for 100 miles then after 1 pull i got the codes P228d and P0089 indicating the rail pressure was too high. Changed out the following parts: New HPFP New Injectors New Low Pressure Pump New Rail Sensor New LP Fuel line sensor New GM Harness for the fuel rails Pulled front cover and inspected to make sure i didnt jump timing. Still have the issue and I'm not sure what else to look at?
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