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    Severe idle problems after TB/Plenum/O/R X-pipe install

    I installed these 3 things at the same time on my 1999 GT, and also used some DIY mil eliminators to hook to my rear O2 sensors to make sure I didn't get a check engine light. Well, after installing all of this, I have severe idle issues. It's very random, sometimes at a stop the car will...
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    Gains from 75mm TB and new upper intake plenum on 99 GT?

    I am considering purchasing a 75mm TB and an upper intake plenum for my 99 GT, and was wondering what kind of hp/tq gains I could expect if I were to do so... The car is stock except for CAI and flowmaster mufflers for now. Also, what kind of additional gains would I see from adding a TB...
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