I have a 94 sedan deville 4.9 liter. It has been losing power and has a bad miss ina fewcylinders. I put on new plugs. wires, cap and a new egr valve. Still it has this miss and a lack of power. It doesn't burn oil. Itjust motor boats around. Any suggestions? Thank you

 

Coil. Replace air and fuel filter as well.

 

Had mycoil and fuel and air filters checked and they came up ok. I really don't know where to look next, maybe the injectors?