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Re: 6.0 runs but no power
Does your fuel pressure gauge have the bleed port on it?
Hopefully it does, hit the bleeder and see if the engine dies. It shouldnt kill it when you hit the bleeder. P0300 with the description of runability you described id bet $100 that pump has pressure but no volume and it will die instantly when you open the bleeder.
Remove the 1st o2 sensors on each bank(precat 02's) and go drive it, if the power is improved you have clogged cats like mentioned above.
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1972 C10 cheyenne super -350/th350 Wifes truck
1971 Nova- 6.0l with some goodies and a t56, 98-02 camaro brakes all around, tubular control arms, etc
2000 zr2 blazer- rock crawler offroad toy, one ton axles and lockers front and rear.
2006 2500hd- 500hp duramax/built allison trans,traction bars, and some other goodies.
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