I'll probably (have to) re-use the AUX AIR REGULATOR for idle. Although idle air stepper motor could be machined somewhere into the throttle body....
$380 for the microsquirt kit: ecu w/ 4 injector terminals, wide band o2 sensor, coolant temperature sensor, wiring harness, relays, fuse, serial cable...
$50 for the MAP sensor,
$20 for additional connectors, and shrink tubing.
$20 for cold air intake.
Approximate Total: $470.
Learn to ride. Ride to learn.