350 tbi shudders

95 350 Tbi does well ideling in park and on the highway but at idel speeds it shudders. And if i slow down to make a stop it shudders til i get my speed back up or floor it . it have new plugs and wires, fuel pump, fuel filter, air filter, TPS, IAC , new throttle body gaskee, new vacuum lines. What else could it be?

95 350 Tbi does well ideling in park and on the highway but at idel speeds it shudders. And if i slow down to make a stop it shudders til i get my speed back up or floor it . it have new plugs and wires, fuel pump, fuel filter, air filter, TPS, IAC , new throttle body gaskee, new vacuum lines. What else could it be?


when above idle the engine has this problem and the advanced age replace the EGR. these do not last forever. the spring gets weak with heat/time and it will open too much .