pulsing revs

[Toms 50th Ani]

Since I got the extractors and exhaust done, I've noticed that while I back off the throttle to 0% when driving 70km+, the revs generally drop to say 1200rpm then it'll occasionally jump to 1500rpm then settle back to 1200rpm repeatedly.

Anyone know what could be causing this?

cheers

 

[Tree cutter]

Mine does it too. Mainly driving around town in economy mode. I noticed it on mine even with the factory exhaust you would see the tacho move between 800-1500 but i notice it more now with the 3 inch exhaust because you can hear it now. I thought it was just a supercharger characteristic.

 

[VTPREDATOR]

yeh, my car has been known to do it here and there.

 

[Toms 50th Ani]

Just doesn't sound right though, maybe something is dirty or a sign it may need a service?

I gotta go back to the exhaust dude to check something out so I'll see if he knows about it being a common thing.

cheers