Why is it stalling? Especially when I am stopped at a stop light.

What is your question?

When I step on the gas pedal, I hear a clanking noise, it gets louder the more I push on it. And it stalls out especially at a stop sign or stop light.

What makes this problem better or worse?

When I let go of the gas pedal, I don't hear the noise.

How long has your 2012 Mitsubishi Eclipse had this problem?

About 1 wk, but yesterday it doesn't want to start, it left me sit on the road bc it stalled.