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I forgot how small the battery is in this truck. I think 5 years is a pretty good run for a battery.

I dont have a booster,  it's just mechanical leverage

oh ok

I dont have a booster,  it's just mechanical leverage

There is no check valve, the valve is set to fully close above 2000 rpm

I'd suggest using 1, if braking effort isn't up to snuff

There is no check valve, the valve is set to fully close above 2000 rpm

Did you use an inline brake booster 1 way valve?

I never had a brake booster, there was no room with my master cylinders being reverse mounted under the dash. The booster port was just the biggest port I had on my manifold. Idle is way more responsive now. It went from a foot long 3/8 hose on each side of the old valve to a foot long 5/8 hose before the IAC valve which now dumps directly into the manifold. I'm still working out the settings to get the idle perfect, but I can at least drive it with the a/c on without stalling.

Did this IAC mod improve drivability?

I understand the issue with sharing plumbing with brake booster, so I guess braking got better?

Upgraded my idle air control. Went from 3/8" to 5/8" hoses and have the air valve dumping straight into the manifold instead of through the brake booster vacuum port. The IAC is for a 2000 Mustang GT.

Man I want to build something like this, but in my area too many people and they complain if I too much fun building anything.

I guess 2 am rippers are in order!!!