car revs like crazy after I removed throttle body

**splatter** · 02-27-2011

I just changed out the thermostat in a 03 Grand Prix 3100. When I put it back together it was chugging and dying. I took apart the intake and throttle body and cleaned the crap out of it. The car no longer dies but it revs randomly and the RPMs will stick at a certain point like 3k or 4k and jump around. The car does this when sensor number 4 from the picture is unplugged (i'm assuming its the throttle position sensor) and also when number 3 is unplugged (i'm assuming its the mass airflow sensor). Anyone know what the problem could be. Also if you could explain the numbered sensors in the picture it would help.

**txslow6** · 02-27-2011

1. Looks like the MAF
2. Looks like IAT

3 and 4 I need to see a closer pic.

One will be TPS and I believe the other is IAC

Hard to tell in the pics for sure, hopefully someone else can help identify.

**txslow6** · 02-27-2011

Are you sure the intake manifold isn't leaking from not sealing right thus creating a decent size vac leak?

**OrangeL67** · 02-27-2011

You probably didn't put that vacuum line back on the front of the TB, or it has a crack in the hose. I did that once after putting my tb back on and My car would Idle at like 2 grand.