Join Date: Jun 2008
Location: Fernandina Beach, FL, USA
Re: Leaning left causes engine to run rough. Still curious.
I just went through a mysterious fuel problem on my LT. Have you performed an canisterectomy? This procedure is widely recommended for most phantom rideability issues, It didn't help me, but, it was the first and easiest step.
The fuel rail is located on the left side, if there is some foreign substance, water perhaps, accumulating in fuel rail it could affect your idle issue.
My local motorcycle Rabbi highly recommends Chevron/Techron fuel injection cleaner,
a partially clogged injector could cause a minor disruption of the spray pattern when leaned.
Go simple first. Around the fuel rail it's a wire/cable/hose jungle. There may be binding of some hose/wire bundle with the throttle linkage that runs below the fuel rail.
On a lighter side, I guess this will eliminate you from the NASCAR Sprint oval races.
There's still the road courses!