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Well big edit since it's a 5 speed. I think it's the iac. The using neutral to keep it running supports it. Foot on the gas. Edit because I thought you had an auto for some reason then re read. 
New edit. It's like a valve that let's air into the throttle body to let it run body closed. It fails little or no 02 dies unless foot on gas. That's my guess. Good luck.
New edit. It's like a valve that let's air into the throttle body to let it run body closed. It fails little or no 02 dies unless foot on gas. That's my guess. Good luck.