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  1. P

    Engine shudders when cruising

    Problem occurs mostly when cruising 40 to 50 MPH, ~2,500 RPM, and trying to accelerate just a little bit. Engine feels like it's hesitating/shuddering a little bit. When I give it a little more gas, she kicks in and revs up no problem. I recently replaced all 4 O2 sensors and all 8 plugs, and...
  2. P

    P0171, P0174 - need o2 sensor?

    Hey all - first post for new member, so be gentle. I have a 2002 XLT w/4.6L V8 (runs great but what a hog) w/95K miles, serviced regularly. "Service Engine Soon" light came on several weeks ago, followed by fluctuating idle when stopped (runs great on the road). Had OBD codes pulled at Pep...
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