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Hey guys, I’ve got a Silverado 2500 that keeps giving me the p0087 low rail pressure code. Did some digging, found the PPE shim kit, didn’t fix it. Put an air dog on, didn’t fix it. Got the PPE rail plug, now it’s saying too high. All of this is accompanied with a change fuel filter message (changed it, didn’t do anything) and a reduced engine power message which only lets me get to about 2500 rpm’s. I’m at a loss now, what’s the next thing to check? Truck is completely stock minus the parts I mentioned. About 240k
 

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When it is happening- Towing, normal driving with heavier throttle input, WOT pulls? What is the scenario when it sets the code for you?
 
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