W124 surging and dying. Please Help!!

[opfor]

Hello All, My 1986 300E has an intermittent problem. It hard starts cold but, that is just a minor inconvenience. The problem is it will "bog down" or lose power at all speeds. While driving, it suddenly loses power and starts to lose speed. I floor it and it will continue dropping like it is out of gas. Most of the time it will kick in and jerk the car while taching out (due to my foot). Sometimes it will die all together and coast to the side of the road. It then becomes a bugger to restart. I have changed the fuel pump and filter. The cap and rotor appear to be good. I have heard CPS, fuel relay, and temperature sensor. I don't want to throw more parts at the problem but I am frustrated. I love the car dearly. It is a hand me down and I just want it running well again. I have searched the Forum but nothing really fits. Help Please!! Thanks for any and all help!!

Chad