Was sup guys, I have a question about my high idle. I just replaced my alternator and a o2 sensor. I have a 94 with a 99 b20b so I only have 1 o2. Now I replaced my o2 sensor with my buddies old one(still good) he wanted to buy a new one bc he has money to do it so I got his old one. Anyways I noticed after I replaced the alternator and o2 when I cranked my car up and let it warm up. The idle was at 1500 and wouldn't go down. I didnt do anything with the idle so what could be the problem???