1994 Mustang GT Weird Miss

Discussion in '94-95 5.0 - Specific' started by xdkylexd, Mar 6, 2014.

  1. xdkylexd

    xdkylexd New Member

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    Ok I bought my 1994 GT stock a month ago. It now has 410 gears ac smog egr delete transgo shift kit msd cap rotor coil. I also replaced the plugs fuel and air filter.. Now I have a strange miss between 4-5k it almost completely stops. Also have a surging idle and when I put it in gear it almost wants to die. When its warmed up.
    Im going to change to 9mm plug wires.
    I checked fuel pressure idling it was at 36psi I dont know where these cars are supposed to be but I have to drop the tank to fix my float anyway.
    Any one had an issue like this?
    Thanks in advance!
     
  2. CC'S95GT

    CC'S95GT Legend

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    the fuel pressure is supposed about 40psi with the vacuum disconnected.

    Whe mine was missing in the upper RPM's, it was the stock coil breaking down.
    Surging idle is usually because of a vacuum leak.
     
  3. xdkylexd

    xdkylexd New Member

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    I hope its not the coil its only two weeks old

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  4. CC'S95GT

    CC'S95GT Legend

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    was the stock one bad? If not then swap it back in and see if it goes away.
     
  5. xdkylexd

    xdkylexd New Member

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    It was bad

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  6. Win

    Win Legend

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    Did you unplug the battery during all this?
     
  7. xdkylexd

    xdkylexd New Member

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    Yes sir battery was actually out of the car

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  8. Win

    Win Legend

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    Did you let it relearn everything?
     
  9. xdkylexd

    xdkylexd New Member

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    Well I've been driving it all week.. maybe the plug wires are breaking down

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  10. Addermk2

    Addermk2 Well-Known Member

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    You're giving the cars computer way more credit than you should.
     
  11. Win

    Win Legend

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    5-6 cycles though isn't too much.
     
  12. CC'S95GT

    CC'S95GT Legend

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    When ever mine runs rough or I get a missfire First thing I go is the basic tune up, Plugs, wires cap and rotor and fuel filter.

    Have you ck'd for codes? You can have one set without the CEL being on.
     
  13. xdkylexd

    xdkylexd New Member

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    Fixed the idle issue found a slew of old cracked vacuum lines replaced them and it idles fine but still has a miss I'm gonna say its plugs that's the only thing I haven't replaced

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  14. Phatboy

    Phatboy Member

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    Mine had a high RPM miss and even though it passed all the testing it turned out to be a bad TPS.
     
  15. xdkylexd

    xdkylexd New Member

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    It was the TPS lol now that thats taken care of Ive also ordered a ZEX dry kit woop wooop
    :****yea: