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Barometric pressure is sensed from the MAP sensor but a different output. Instead of atmospheric calculation, it is converted to barometric.
The idle is the easiest shit to deal with. The only problem you have right now is the weather. The heat is making it hard to adjust your A/F ratio.
Instead of leaning it out, add more. When I was OBD2, I think I had my idle steady at -35% narrow (1000 RPM). Play with it until it gets steady. You wont blow up shit. The worst thing that could happen is your car will bog down. Try that......
You wont have problem with 10 psi. I hit 12 psi without a code plenty of times. The weird thing is, street tuning this kind of set-up gets really annoying, especially at this kind of weather. My friend set-up his -45% all the way across and dynoed 200.5 whp 165 tq on his 1.5L VTEC OBD1. I didnt even hit that high on mine. He is using my D16 turbo set-up.
Leaning it out some seems to make more power. But risky in many ways. Get a wideband bro.....
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