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lean pop

  1. Engine 1990 LX 5.0L EFI Mustang Fuel Management Problems - HELP!

    I bought this car with all the go-fast parts installed by a shop from the previous owner in Pennsylvania. When I bought it, it ran great with no idle or other misfire or rough idle issues. I moved back home to California and needed the car to pass smog certifications. I had to do the...
    • 5.0LXStanger
    • Thread
    • May 25, 2025
    • fuel delivery help needed lean pop rough idle
    • Replies: 45
    • Forum: Fox 5.0 Mustang Tech
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