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Twin F150's die when put in gear or back

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  • Twin F150's die when put in gear or back

    I have 2008 twin F150's that started dying when put into gear or back to neutral. They start, idle and run great but just when you either put them in gear or take them out of gear they die. Sometimes both die and sometime just one. You can put one engine into gear and bother can die or you can put both into gear or neutral and they die or just one dies. But not consistently or every time. Once in gear, they idle great and run great. I have been told it is a TPS, injector issue, IAC valve sync and link and mnay other ideas but just cant figure it out. They will go back to the shop next week but I am just trying to see if anyone elase had this problem and what the fix was. After several tries, it seem like they are better cold and has more issues after they warm up. But why both are doing it at the same time as well as when one goes into gear is puzzling me.

  • #2
    seems to me there is an underlying issue as to why the iac cant control the idle, what is the idle speed while warm in neutral,

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    • #3
      test the ISC valve,check the shift position/cut switch.

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