ever seen dribbling TBI injectors :

[andy2175m4]

I have a Holley 650 cfm throttle body, and the front two injectors fire at idle. Frequently fuel dribbles and puddles around the center of the throttle body at idle. The fuel map is lean, and the 02 sensor is reading normally, and the injectors open and close and shut off crisply when manually opened with 12 vdc, on command, but during idle it dribbles.

any thoughts ???

[Fuelie Fan]

Your pulsewidths are probably too small in the idle range, less than 1.2ms I'm guessing. This will cause a poor spray pattern. Look into dropping your fuel pressure (unfortunately you can't go down much on tbi, i would say 9 psi is as low as you can go) or smaller injectors.

[aggressive male]

I have a Holley 650 cfm throttle body, and the front two injectors fire at idle. Frequently fuel dribbles and puddles around the center of the throttle body at idle. The fuel map is lean, and the 02 sensor is reading normally, and the injectors open and close and shut off crisply when manually opened with 12 vdc, on command, but during idle it dribbles.

any thoughts ???

Wait a minute. Are you using this throttle body with a holley computer? Are you sure it is the 650? I thought the 650 had only 2 injectors but you say front 2 as if there are more. Perhaps you are trying to use a computer meant for 2 injectors to run 4? I know your not supposed to do that.