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2006 Jeep Wrangler Unlimited Rubicon, too many mods to list.
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One of my suspicions would be the vacuum diaphragm on the brake system has a big leak, and the moment you step on the brake, it takes away your vacuum by letting a rush of atmospheric air in to the system. Test by pinching off the large (about 3/4” od) hose to the large diaphragm housing and depress the brakes again with the engine running. If it still stalls, that is not the issue. If it has no effect, it’s your likely culprit.
 

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2006 Jeep Wrangler Unlimited Rubicon, too many mods to list.
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1,467 Posts
That would raise the RPMS, not lower them.
It would certainly lean the bejeezus out of the mixture, which at first glance would indeed raise the idle Rpm. But what if all intake vacuum suddenly went to atmospheric pressure? on throttle body injected engines, wouldn’t that take most of the fuel out of the intake by bypassing the intake tract?
 
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