The effect of Coulomb interaction in quasifree scattering and quasifree reactions has been investigated under different kinematical conditions for the processes involving up to two charges per particle and a total of six nucleons in the incoming channel, and three particles in the outgoing channel. The differential cross section was calculated using the plane wave impulse approximation. The influence of the Coulomb interaction on the magnitiude and shape of these spectra were determined and compared with experimental data. It has been found that for the quasifree peak of the Coulomb effect within this model depends only on the outgoing particles in quasifree vertex and on energy between them. At low energies the influence of the Coulomb interaction cannot account for the discrepancy between the quasifree data and the impulse approximation predictions, although it can produce effects of several orders of magnitiude, depending on the energy and the charges of particles. The Coulomb interaction changes only the magntiude, and has a very weak influence on the shape of the quasifree spectra. At high energies the Coulomb influence on the maxima of the spectra is in the 5--20% range. When those Coulomb effects are taken into account and when a proper wave function for the spectator-transfer particle system is used, then at energies above 200 MeV this model agrees with data.