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  1. S

    Weird hard start

    UPDATE got my buddies snap on scanner to check my fuel trims and alcohol %. They were way off. Fuel trims were at -25 and my alcohol % was reading 75. Reset both of these and now the Yukon is starting and idling perfect.
  2. S

    Weird hard start

    correct
  3. S

    Weird hard start

    Thanks guys. Thinking of doing and alcohol and fuel trim reset too
  4. S

    Weird hard start

    Fuel pump was leaking. Dealer I bought it from replaced it
  5. S

    Weird hard start

    Thanks. Now it’s seems to hard start on every cold start. Runs rough for 10-15 seconds then it’s fine. Fuel pump was replaced 2 months ago. I added an AFM disabler about 2 weeks ago. Gonna try to unplug that and see what happens. I did notice some rough running on cold start once I installed that.
  6. S

    Weird hard start

    Hey guys. New here and need some help. I have a 2011 Yukon SLE 5.3. I leave my house in the morning. Starts and runs fine. Drive about 25 miles to work. Work all day. When I go to leave work it will crank and not fire till I step on the gas pedal. Once it’s running it runs and drives perfect. I...

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