Yeah we're missing some information here. What computer you have is VERY important. Like 91 said, the injector/MAF combo is another concern. If you're using an aftermarket or Cobra MAF for 24# injectors, it may not run right with 19s. Does the explorer throttle body have an air-bleed hole in the blade? Lacking that the computer may be trying to adjust with IAC, which can cause weirdness.
Having owned and been around a shitload of Fox mustangs, with bolt-on mods and things like aftermarket cams, they usually hunt for idle when cold but get better as they warm up. Sounds like you're going the other direction. The overheating could indicate it's running lean, or that the cooling system just isn't up to snuff. Lots of factors here so a complete list of parts and work done would be good information.
Having owned and been around a shitload of Fox mustangs, with bolt-on mods and things like aftermarket cams, they usually hunt for idle when cold but get better as they warm up. Sounds like you're going the other direction. The overheating could indicate it's running lean, or that the cooling system just isn't up to snuff. Lots of factors here so a complete list of parts and work done would be good information.
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