Thread: 2000 Grand Prix, high idle or normal?

Also when cold started the RPM's fly up 2.5k and then go back to bout 1.5ish. Also when i turn the engine off, bout 2-3 seconds later ill here a short hhh sound, sorta like a hiss. My scan tool won't do TPS readings. Warm 700 rpm readings are MAP 4.9psi, spark adv 23.5 IAT 84, MAF 0.01

I unplugged my MAF sensor at idle and it didn’t change a thing, it stayed running. I thought when they are working correct the car will shut off when unplugged? When i plug it back in running engine makes a weird noise. Didnt change my idle cold though being unplugged.