# RPMs **URL:** \ **Category:** Maintenance/Repairs\ **Tags:** tribute, mazda\ **Created:** [August 19, 2009, 8:19pm UTC](https://community.cartalk.com/t/rpms/35293 "2009-08-19T20:19:45Z")\ **Posts on this page:** 5\ **Page:** 1
**Author:** ![TooMuchrpms](https://avatars.discourse-cdn.com/v4/letter/t/77aa72/32.png) [@TooMuchrpms](https://community.cartalk.com/u/TooMuchrpms)\ **Post date:** [August 19, 2009, 8:19pm UTC](https://community.cartalk.com/t/rpms/35293/1 "2009-08-19T20:19:45Z")
I just got back from a road trip and when I stopped at a stop light headed home the rmps in my car were up but I was stopped. This has continued to happen all week, my rpms go up when I am in neutral or am stopped and then they go down a little and then down a little more. The check engine light has not come on and the rpms are up around 1,5 to 2 so it is not that high but I am still concerned. I took my car to have it looked at and they said it might be the alternator but they really couldn’t be sure…Any thoughts? ---
**Author:** ![VDCdriver](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/vdcdriver/32/30_2.png) [@VDCdriver](https://community.cartalk.com/u/VDCdriver)\ **Post date:** [August 19, 2009, 9:07pm UTC](https://community.cartalk.com/t/rpms/35293/2 "2009-08-19T21:07:15Z")
When RPMs vary up and down considerably, the first thing that I look for is a vacuum leak. ---
**Author:** ![Caddyman](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/caddyman/32/23_2.png) [@Caddyman](https://community.cartalk.com/u/Caddyman)\ **Post date:** [August 19, 2009, 9:09pm UTC](https://community.cartalk.com/t/rpms/35293/3 "2009-08-19T21:09:00Z")
What kind of transmission?? ---
**Author:** ![oldschool](https://avatars.discourse-cdn.com/v4/letter/o/e19adc/32.png) [@oldschool](https://community.cartalk.com/u/oldschool)\ **Post date:** [August 19, 2009, 9:41pm UTC](https://community.cartalk.com/t/rpms/35293/4 "2009-08-19T21:41:16Z")
2000 rpm at idle is definitly the sign of a problem,you should be concerned. ---
**Author:** ![the\_same\_mountainbike](https://avatars.discourse-cdn.com/v4/letter/t/c89c15/32.png) [@the\_same\_mountainbike](https://community.cartalk.com/u/the_same_mountainbike)\ **Post date:** [August 19, 2009, 9:51pm UTC](https://community.cartalk.com/t/rpms/35293/5 "2009-08-19T21:51:51Z")
I’d consider the Idle Air Control circuit also a good candidate. Here, I found this link that’ll give you a good insight into it. > **[How Idle Air Control Valves Work Explained in Under 5 Minutes](https://www.2carpros.com/articles/how-a-idle-air-control-valve-works)** > > Repair guides, articles and advice for car owners, enthusiasts and repair technicians.