engine rpm drop at idle?
 

While sitting in neutral and when I rev the engine, as the rpm drops it drops below idle and goes back up to normal idle rpm. When it hits it lowest rpm it sounds like the valves are banging on the cylinders. I know others had this problem before but what can I do to fix this? It doesn't happen all the time. I also made a video that I will upload when I get home.

Sub'd

Have this problem too, Cell by any chance when that hapoens does your Batterry Gauge seem to drop aswell???

Is this a stock tune or Uprev?

I get this, too, and I can hear the fuel pump motor sag.

updated post with video.

Don't know.

stock. does uprev fix it?

sub'd

My does something similar but when I'm driving and come to a stop, the rpms drop and I can feel the car almost like shudder.

Anyone with uprev and tuned have this problem?

I've got the UpRev tune, but I don't remember revving it seeing it drop like that since it's something I hardly do. However, if I let my car idle for several minutes or warm up there are times idle drops momentarily.

Mine has Uprev and my idle is steady + or - 15 rpm

wow, never seen my rpm drop that low

If you're still under warranty, let the dealer worry about it.

I'm no expert but if this was happening to me I'd try a few things that are easy to check and/or fix.
Dirty air filters. Real easy to check and change if needed. Instructions in Owner's Manual.
Dirty MAFs. Easy to check/clean if you have a few common tools. Spray cleaner is available at most auto parts stores.
O2 sensors. Easy to check if you have an OBD/CAN scanner.
Vacuum leaks. Check all the hoses and fitting on the engine.

An OBD/CAN scanner will also allow you to check other engine variables that might be related to the problem. Good investment if you plan on doing any troubleshooting or mods.

Maybe someone who is an expert will chime in soon.

Car has 2400 miles on it and the only mod is a catback exhaust. I think it might be the stock tune.

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This is what i meant , didnt know how else to put it lol :icon18: