My '08 990A developed the high/erratic idle problem during a road trip. None of the easier fixes helped, and two shops found no engine faults or other clues when hooking the bike up to diagnostics. I limped home by frequently restarting the bike (including while rolling in traffic), and am trying to sort things out. I have a couple of questions about the role a funky throttle cable might be playing. I've also included notes on where I stand with causes/fixes from other threads. Any words of wisdom appreciated. I have moderate mechanical aptitude, but don't have a TuneECU and haven't wrapped my head around the finer points of the bike's electronics. The engine is stock, except for a tamer throttle cam. Thanks! THROTTLE CABLE QUESTIONS: -- I can't tell from my shop manual, etc., if it's the "return" cable or not, but one of my cables has a crack in the plastic sheath (where the cable passes the steering tube) and a little corrosion showing through. (It's the cable that connects to the "close" side of the throttle tube (closer to the rider.) -- Am I correct in seeing that more recent 990 manuals show how to replace the throttle cables? Mine doesn't cover it. If anyone wants to send me the relevant pages, I'd be grateful. -- I was thinking of doing the replacement at home, and then have a KTM shop do the fine adjustment. But if they're deep enough into the airbox to adjust the cables at the throttle body, check the TPS, etc., maybe I'm not really saving much cash? MORE ON THE SYMPTOMS: -- Bike will run fine for awhile (anywhere from a few hours to a few minutes), then start misbehaving in one or more ways: Not much engine braking when I close the throttle. Idles at 1.5k, 2k, 3k, and a few times even 4k rpm when throttle closed and clutch pulled or in neutral (it normally idles closer to 1.3k). A few times, the idle jumped really high on its own (3k or more), with throttle closed and bike in neutral. -- Turning off the key and restarting the bike fixes it - for a while. -- The problem started during a road trip, and got progressively worse over several days. Limping home, I eventually was restarting the bike very frequently, and practically couldn't ride through towns. -- The bike seemed to get a mid-RPM surge in mid-gears (3rd and 4th) when the idle was starting to get out of whack again. Which points to a TPS issue per some other threads. -- Also noticed that when it was idling high, the RPMs would drop some when I put the bike it gear. (I only tried putting it in gear this way a couple of times.) -- Also noticed that during key-on initialization, when the tach is returning to 0, it drops faster when it passes 2k (but maybe that's normal and I never noticed). -- Mileage poor by trip's end, no surprise. POSSIBLE CAUSES/FIXES FROM OTHER THREADS [AND MY STATUS]: -- 15 minute reset. [Tried this several times, didn't help.] -- Bad batter connections. [Mine seem fine. Battery is also newish.] -- Fuel filter/pump issues. [Not really checked, but I ruled this out as it runs very differently than when I had a clogged filter a few years ago, and it runs fine for periods of time, etc.] -- Air temp sensor at top of airbox. [Appears properly connected, not otherwise checked.] -- Throttle body vacuum/air leak. [Not really checked, though there's nothing obviously loose in the airbox. Though note the valves were recently adjusted....] -- Bad regulator. [Not checked] -- Reset the idle controller. [Not checked] -- Throttle position sensor (check, adjust, or replace). [Not checked, except that nothing showed up on diagnostics. Note I was getting the surging that some threads like to TPS issues.] -- O2 sensor. [Not checked, aside from nothing showing up on diagnostics.] -- Bad stepper motor. [Not checked] One of the shops did find and replace a bad exhaust gasket, thinking it would help. It didn't help, but the gasket was definitely bad - breaking apart and sliding out. Too bad I didn't catch it at home. They also reconnected the air tube that runs from the charcoal canister to something in front of the air snorkel (an air valve, per my parts diagram), which as far as I can tell had no effect.