Bonneville America Forums Forums Technical Forums Performance Mods TBS needles=performance or driveability?

I put TBS needles in mine as well as drilling the slides. It seems to run better under normal driving conditions. It's more responsive to small throttle increases. But it still seems lean. On cold days it just seems a little flat at times. I hesitate to shim them due to my already lousey mpg. But since the TBS needles are longer maybe a shim won't have too much of an adverse affect on mileage. It's easy enough to try anyway.