phillipin

I jumped my diag port because of the issues i'm having with the engine stumbling.

Im gettin error 31 also known as

MANIFOLD AND/OR AIRFLOW METER SENSOR SIGNAL CIRCUIT
--AIRFLOW METER/CIRCUIT

--MANIFOLD PRESSURE SENSOR/CIRCUIT

--ECU


So I know i should check all my vaccum lines but what else should i check, or pull out and clean. at idle sometimes i can hear little poots of air popping out. So i'm wondering if i have a cut vaccum or cracked vaccum line somewhere.

please give me suggestions here.

I cleaned my maf sensor twice and this probably has something to do with it, but im not 100% sure.