welcome back to my 95 D21 project.
the AAC, AIC, or IAC Valve, however you want to say it, can cause your truck to surge while idling mimicking a bad head gasket or other issues. i couldnt find a video on how to replace or bypass this valve so i thought id put one up on my mechanic's fix. runs fine now, but in cold weather you have to hold the gas a little as the motor wont be able to easily regulate the air intake flow on start up.
