flex fuel

  1. F

    2002 tahoe idle problems

    Howdy I am new here i joined because I have the a 2002 Tahoe. I am also a member over at gmt400 (I am r422b) When it is cold my flex fuel 5.3 does not idle smoothly it stutters and the rpm bounces. Also I have codes P0174 P0171 P0440 P0449
  2. K

    Engine knock

    I have an 04 Tahoe z71. Engine code z (flex fuel). I changed the oil today and after driving 20 miles on brand new mobil1 5w30 and a Bosch premium filter I have loud knocks coming from the bottom end. I owe a lot of money in taxes and a baby due in April. Does anyone know why this is happening...
  3. R

    2004 z71 Tahoe Flex Fuel Pump

    Hello All, I have a 2004 z71 Tahoe with the 5.3L flex fuel model. Occasionally after I have been driving for awhile the truck will randomly stall out and kill itself. The idle get rough and drops to about 200 rpm. I let the truck sit for about 5 to 10 minutes, the truck will start back up fine...
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