Auto Parts: 4.3liter v6, throttle body injection, gmc sonoma

Question
Is my 1989 GMC Sonoma with a 4.3liter V6 carberated, throttle body or full injected

Answer
    They were still using the throttle body injection in '89.  GM called it TBI, and it consisted of two injectors mounted in a throttle body with a pressurized reservoir of fuel.  Pressure is controlled by a pressure regulator built into the throttle body, but easily repaired.  The injectors are kind of pricey, but there's only two of them.