TBI Injectors

I've noticed that one of my injectors is dripping intermittently. Every time theres a drip the engine lopes/hesitates. My question is, can anything other than a dirty/fouled injector be the cause of the drip? If so, what else should I look at after I service the injectors?

Try running a bottle of Techron injector cleaner through fuel system with about 1/2 tank of gas, if still no good replace the injector.