I was in Mansfield today visiting the folks and my ol' mans Buell has been acting up for awhile. It's a 1999 X1 Lightning with 4092 miles on it. Symptoms: - Rough idle (assuming it idles, most of the time it dies after a few seconds) - Sputters / spits / coughs during operation - Won't get above 4k rpm no matter how hard I wrench the throttle - Basically runs like crap under any load Note: We had the airbox off during these tests and it makes a horrendous chuffing / popping sound when getting in/out of the throttle. Is there something about those airboxes that they need to run restricted? ie. not open to the air? Things we've checked - *My brother told me he cleaned the spark plugs and plug wires have been checked *Removed the fuel tank and checked the fuel pump resistance (approx. 2.6 ohms, seems normal? Should be pulling 3A @ 14V -- 2.6ohms makes it close, so it's about half the resistance it should be). I did note that the fuel pump sounds odd when it primes itself before the bike starts. *Resistance of both fuel injectors = 13.6 ohms *TPS sensor resistance from 800 ohm to 2.1 kohm *Replaced fuel in fuel tank with some VP Blue my dad had lying around (bad gas ruled out) *Fuel filter OK *Held the Infrared Temp gun to both headers about the same distance from the exhaust (near the head) and they read about the same temp (260*), so we ruled out "single cylinder operation" I still think it's the fuel pump, or maybe the engine temp sensor. I took it for a ride down the driveway and back (approx 1/2 mile) and it finally threw some codes. Put a Jumper on the diagnostic port... threw blink codes 11 (TPS sensor), 13 (O2 sensor), and 33 (Fuel Pump). My ol' man says he might just bite the bullet and drop it off at Hales HD to have it fixed (This, coming from the same guy who works on CBXs, can sync 6 carbs and work on those massive valvetrains) . He's just getting frustrated he bought American and is now regretting it. I'd like to think we can avoid the dealership...Any ideas? TIA ORDN crew.