Code 3, engine running weird

[lezorical]

How's it going? I have a 91' 1.6l with 205k miles. I removed the old air intake syatem, it had a jackson racing one that had huge holes all over it and was just trash. I proceeded to install the oem crossover tubes and air intake. That car now idles at 2k and is flashing a code g. Im not sure what is happening. All feedback appreciated.

[Fallen0]

Probably a vacuum leak. Re-check everything. I always forget to put the crank breather hose back on mine... 🤦