Tach fluctuating at idle

[rjcamaro]

I have the V6 Auto. I noticed when sitting idle my tach needle moves up and down about 25-50 rpms. Anyone else noticed this?

I would thought it should be pretty steady...

Thanks!

[wylde1]

perfectly normal when it's idling low. the more you rev the steadier it'll stay. but after it's warm and it kicks down to the low idle it's more difficult to stay steady so it'll hunt a little bit.

[ron10]

+1

[metthem]

I noticed lately and at this time I am thinking it has something to do with the heater being on or the a/c compressor when I have the front defroster on. When I take it out of gear the rpm's come down to about 1,000, then after a few seconds still out of gear, the rpm's drop real low and pop back up, almost like its about to stall and then it catches itself. Like say im cruising 35 in 3rd or 4th gear and am going down a long hill and take it out of gear and freewheel, the rpms come down to where they should and then they drop too low, then it shudders. Happens sometimes when I get to a red light too. I turned the heater off and tried to duplicate it a couple times last night, and it didn't do it. I'm not sure yet, will take it out and try today. Oh, and i sit in my car at lunch sometimes and leave it running, and it acts perfectly normal, with heat on.

[v6sonoma]

Normal.