Engine Missing RPM

[johnsnow]

I have a 987 Boxster with 80k miles on the clock and when I roll up to a halt letting the engine brake (no matter what gear) when the car hits 1100 rpm it jumps down to 1000rpm - missing 100rpm. Physically you feel a minor jolt

Any ideas what would cause this? Air leak? MAF? seems strange to occur at the exact same rpm every time

[mikefocke]

What transmission?

[johnsnow]

Manual 5 speed - no error codes as well (at least according to durametrics)

[very~worn~944]

Try cleaning your throttlebody real well and then readapting it.

[johnsnow]

Originally Posted by very~worn~944

Try cleaning your throttlebody real well and then readapting it.

Thanks, ill give that a go. Excuse the newbieness but what does "readapting it" mean? - disconnecting the battery negative for an hour to reset?