# Surging RPMs? Any insight please. **URL:** \ **Category:** NYSpeed Automotive\ **Created:** [February 16, 2008, 9:44am UTC](https://forums.speedlife.net/t/surging-rpms-any-insight-please/43546 "2008-02-16T09:44:42Z")\ **Posts on this page:** 1\ **Showing post:** 15
**Author:** ![Clean\_Baldy](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/clean_baldy/32/7308_2.png) [@Clean\_Baldy](https://forums.speedlife.net/u/Clean_Baldy)\ **Post date:** [February 16, 2008, 2:15pm UTC](https://forums.speedlife.net/t/surging-rpms-any-insight-please/43546/15 "2008-02-16T14:15:12Z")
> [@90NA300ZX](#): > > do you have a vacuum/boost gage? i’m sure somebody on here has an extra one…and it takes 2 seconds to just tap into a vacuum line to get a reading on it…just look online what the vacuum is supposed to be at at idle, and then observe what you have. if it’s low, there’s your first step to fixing the problem…and even if you dont have the time or capability of fixing it yourself, you at least saved yourself the money you’d spend at a dealer on diagnosis. just go there and tell them you have a vacuum leak, find it and fix it. otherwise they’ll run 2 or 3 hours worth of tests just to say “yup it’s a vacuum leak…that’ll be $250 for diagnosis…” I just went outside to do a thorough underhood look to see if anything was loose, how the MAF sensor looked, etc. As I got back in the car to turn it on, the CEL stayed on. Now I wish I knew someone with a scanner! --- _[View the full topic](https://forums.speedlife.net/t/surging-rpms-any-insight-please/43546)._