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Originally Posted by mazdaRX7Galantvr4
It's possible you could have a rip in your brake booster diaphram. It probably isn't a coincidence like that. I'd recheck your vac lines and clamps on your parts.
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A problem like that with a booster will cause it to fail and you will have an extremely hard pedal. Since he's not describing that it's a vacumm problem elsewhere.
It sounds like you have a problem with the idle vacumm. The root of all idle vacumm comes from your intake. Check your intake piping hoses and, also check the small vacumm hoses that connect to your throttle body and IACV. Sounds like you have a clogged hose that's preventing idle air to circulate. thus the need for you 1200 rpm high idle. The higher the idle the more air you have flowing into the intake. Your idle shouldn't be above 800 and that's pushing it. I would go to your local auto shop and buy about 3' of 3/8" vacuum line then go into your engine bay and start pulling off old hoses and checking them for flow I guarantee you, you will find at least one hose that's completely clogged.
I have found 3 on my intake system so far....and I'm still checking them little by little. The S13s are old and having petrified hoses is not uncommon.
GL