Timothy is called an evangelist in 2 Tim. The task of preaching the gospel, although theoretically everyone's responsibility, is entrusted specifically to certain individuals by the Holy Spirit. They are to exercise their ministry in the full realization that the power comes from God, making faddish and manipulative techniques not only unnecessary but wrong. When such are present, it is a clear indication that the Spirit is absent. Converts from the evangelist's ministry are to be funneled into the church where they are to be built up by those exercising the other gifts.
Service is called a gift in Rom.
It is difficult to know exactly how Paul means it here. It is perhaps a generalized gift of power to anyone exercising a specific function in the church. All are to give to the needs of the church, its ministry, and the poor, but a special gift enables some to make joyous sacrifice in this area. Merciful acts are to be performed with cheerfulness under the guidance of the Spirit. It might be wondered why such a noble act would require charismatic endowment, but the circumstances of the time explain it.