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Showing results for tags 'p0174'.
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Have a 2003 Silverado LS with 5.3 @ 149K miles. Engine running sluggish and flashes check engine light once you try to accelerate above 50mph. Pulled codes. P0174 and P0300 r codes. Changed plugs, wires, and fuel filter. No change. Plugs on passenger bank all black and sooty (see image). Drivers side showed sm wear but nothing like bank 2. Fuel is 48psi idling and bumps to 53psi when revving. Fuel pressure regulator is not leaking and shows no sign of wetness anywhere in hose connected. Reading all over web about possibilities from fuel pump to upper intake gasket to EGR to MAF. But those are all usually accompanied with P0171 also. Any thoughts??