Throttle body fuel injection system with improved fuel distribution and idle air control

A fuel injection system comprising:

• a throttle body assembly defining an outlet side dimensioned to mount atop an intake manifold of an internal combustion engine;
• a bore formed through said throttle body assembly, said bore defining an inlet and an outlet wherein said outlet is open at said outlet side;
• a throttle valve disposed in said bore;
• a fuel injector mounted to said throttle body assembly;
• a fuel distribution ring disposed in said bore providing circumferential flow of fuel therethrough, said ring defining a circumferential groove having upper and lower ends and inner and outer circumferences, said inner and outer circumferences extending between said upper and lower ends;
• a plurality of openings formed in said lower end of said fuel distribution ring in fluid communication with said fuel injector whereby fuel is injectable from said fuel injector into said bore through said plurality of openings at a first point upstream of said throttle valve;
• an idle air control passage formed through said throttle body defining an outlet port in fluid communication with said bore at said outlet side and an inlet port in fluid communication with said bore at a second point that is downstream of said first point and upstream of said throttle valve;
• and
• an idle air control valve disposed within said idle air control passage, a position of said idle air control valve varied by an idle air control motor.