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I just got a new thermostat, fan, radiator, tranny cooler lines, new tranny fluid, new headers, X-pipe, and spin tech mufflers. The second bolt from the left on the passengers side Header wouldnt go in and someone told me that it wouldnt really matter?...So when I start up my car it will idle very rough for like 30 seconds then smooth out. Whats the problem guys? Also my motor mounts are in for some new ones. I have no knowledge of Mounts so let me know as much as you can.
 

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The header bolt really depends on how thick and how true the flange is on the headers. A good straight flange and you can probably get away with it, a thinner one or one that's not perfectly flat and it will leak, or you'll blow the gasket out after a while.

Problem just started after you swapped everything? Did you disconnect the battery at all?
 
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