01 Impala 3.4L Idle issues

[zmame]

Hello i'm the lucky owner of a 2001 Impala 3.4L

I'm having issues with idle some days its fine others it revs a little high (it will cruise at 40mph w/o gas pressure) Some days it screams. some days its normal.

Here is what i done

I unplugged IAC when car was running normal and it will run normal all day long with it unplugged. If I plug it in and drive for a while it acts up. So I replaced IAC and cleaned IAC ports with q-tips and TB cleaner. It no longer screams like it use to some mornings. But still have issue with it driving the idle will creep up to where i have to ride the break in town.

Now here is what i noticed as soon as i unplug TP sensor it stops high idling.

Do you think this could be a faulty TP or is there somthing els that controls the idle

[maxwedge]

A bad tps can cause this but without a proper scan it would be guess work.

[jdl]

Any applicable codes? You may need to take the throttle-body off and clean it, all passages. The pcm uses the map sensor to determine if tps signal is in range.

[zmame]

Originally Posted by jdl

Any applicable codes? You may need to take the throttle-body off and clean it, all passages. The pcm uses the map sensor to determine if tps signal is in range.

No there is no codes being thrown. Unfortunatly I do not have a scanner to read tps only hand held code grabber. I bought a TP sensor it was cheap enough I'll try that if it dosen't work then I will take your advice and remove and clean TB.

Thanks a mill for both your guys help

[jdl]

You could use a digital multimeter on the tps signal wire, key on, move throttle up and down, see if voltage signal moves up and down smoothly?