Just swapped my plug for a brand new iridium.

Checked the gap, was within spec.

About 1,000 miles in, and now my idle speed seems weird?

Clock reads tick over at 1400 rpm, but it seems lower, almost like it's about to stall.

Twice now, it has stalled on me, on change-up from 1st to 2nd.

Also, if I'm in the low rev range of just between engine braking and accelerating (ie, just enough to keep rolling) it seems very stuttery... like the chain is snagging (but it's not)?

I'm pretty sure the only thing I've done lately is change the plug?

Any thoughts?

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Bike: 2013 XT660Z, TKC70 tyres

Mods:
Barkbusters, Scottoiler, DIY Tail Mod, DNA Stage 3, Power Commander V & O2 Eliminator, Exan X-Black Stainless exhaust, Tool tube, Ohlins linear front fork springs, Nitron rear shock, JT front and Supersprox rear sprockets, D.I.D. VX 520 chain, Adventure Spec bashplate, DIY USB Outlet, DIY chain guide, Kev's Throttle mod

http://www.facebook.com/onemooseonemotorbike

Try a different (new?) plug first, preferably a standard copper cored one, to rule out whether or not its the plug (or the whether the iridium is the issue).

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Oh, and this might be worth a read too...

http://www.xt660.com/showthread.php?t=21527&highlight=iridium+plug

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Chain correct tension, cush drives worn in ?

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you win some, lose some, crash some
K+N filter, snorkel removed, homemade kev mod (with his blessing), co raised,
Pipeworx cans, r1 led back light, under tray removed, small indicators, handguards, cnc short levers,

I obtained a new NGK iridium plug of ebay and once fitted it into my XTR I noticed the bike did not run as well as it did when running on standard and the fuel consumption increased.
I check up on the NGK web site I found that the plug I got of ebay was a counterfeit, if you have the old box the plug came in, the NGK web site will show what to look out for and how to spot a counterfeit.
Since then I have fitted another iridium plug but this time supplied by local motorcycle shop and its happydays are here again.

ive only ever run my xtx on the iridium plug done 12k miles i think i did 10 mile from showroom to my house and switched out as id had good use of iridium on all my previous enduros