TPS voltage should be set to .995, but it does not really matter in this case.
A bad exhaust leak will cause bad gas milage so get the header flange tightened up as soon as you can. However an exhaust leak will not cause a roaming idle. Have you checked the EEC for codes? Are you sure you are getting proper EGR function?
Does the idle search and eventually die when the engine is cold, luke warm, hot, or always?
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