rpms studdering

[nitrouseclipse1]

hey guys if any of you could help me it would be appreciated anytime i get on it my rpms will start to jump up in between 4,000 and 5,000 rpms they will jump up then jump right back down to where they should be but it don't do it all the time.

thank you for any help you can give me

 

[Julia]

I would check your ISC ( idle speed controll) do a search on that and you should get plenty of good threads that cover this issue. Good luck

 

[nitrouseclipse1]

i replaced the isc (idle speed contol) it seems that did not work it seems now that the rpms are starting to studder alot more around 4200-4500 rpms if you have any motre ideas i would greatly appreciate it. thank you

 

[ddavisaf]

Check all of your ignition system components.
-coil pack
-spark plugs
-plug wires

Got a CEL?

 

[KeithL322]

Is your vehicle an automatic or manual transmission?? if its automatic it could be your transmission slipping, what you described sounds like what my friends 92 Z28 did before he got the tranny rebuilt

 

[nitrouseclipse1]

no i dont have a automatic i have a 5 speed but thank you anyway