Hi new to the fourm here. My friend just bought a 91 nissan blue bird atessa sss awd with a sr20det. The issue is the car has a bouncing idel and when it drops down the car will stall unless u give it some gas. The previous owner changed the intake gaskets and check for vacuum leaks. We're gonna take a good look for vacuum leaks when it's warm out but it's kinda hard when it doesn't want to idel. Just wondering if anyone knows what els could be causing this issue
Thanks I advance

Check the maf