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rough idle stalling after engine swap

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  • #1

    rough idle stalling after engine swap

    ok swapped out the motor in my grand am with a 05 3400 with 300 miles on it.
    got everything back together and now it will idle around 2grand and then gradually die off completely stalling the car out. this is a brand new motor practically, it should run fine.
    already checked th iac and swapped out throttlebodies cause the plenum and tb were diff than what i had. but everything else is brand new.
    sigpic
    99 Grand Am GT
    3400/3500 -Solid trans mount--TCE 65mm T-body---85mm LS2 maf---1 1/4' TCE intake spacers with 3400 upper--SLP Catback with flowmaster 80--TOG headers
    Modded 3400 lifters with LT1 springs---Comp Cams 26986 Springs
    1357 cam 227 233 .050 dur     515 515 lift 112 lsa
    15.232@88.85mph on stock 3400---New time to come

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  • #2
    Sounds like a vacuum leak maybe?
    sigpic New 2010 project (click image)
    1994 3100 BERETTA. 200,000+ miles
     16.0 1/4 mile when stock. Now ???
    Original L82 Longblock     with LA1, LX9, LX5 parts
    Manifold-back 2.5" SS Mandrel Exhaust. Hardware is SS too.

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    • #3
      yeah it was plenum had a crack in it. swapped it out and everything is fine.
      sigpic
      99 Grand Am GT
      3400/3500 -Solid trans mount--TCE 65mm T-body---85mm LS2 maf---1 1/4' TCE intake spacers with 3400 upper--SLP Catback with flowmaster 80--TOG headers
      Modded 3400 lifters with LT1 springs---Comp Cams 26986 Springs
      1357 cam 227 233 .050 dur       515 515 lift 112 lsa
      15.232@88.85mph on stock 3400---New time to come

      Comment

      • #4
        Plenum had a crack?

        Got a pic?
        Okay now, that's enough of that.

        Comment

        • #5
          ill get one later it was right above the bolt hole through and through. on the alt side.
          sigpic
          99 Grand Am GT
          3400/3500 -Solid trans mount--TCE 65mm T-body---85mm LS2 maf---1 1/4' TCE intake spacers with 3400 upper--SLP Catback with flowmaster 80--TOG headers
          Modded 3400 lifters with LT1 springs---Comp Cams 26986 Springs
          1357 cam 227 233 .050 dur           515 515 lift 112 lsa
          15.232@88.85mph on stock 3400---New time to come

          Comment

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