1995 Ford Bronco Engine Idle rough with surge/stumble while

Hello. I have a 1995 Ford Bronco (Full Size) with 351. I am having a few engine Idle problems that I can not seem to eliminate. The first one is the engine is surging. When cold/first start, it is up and down 300-400 rpm. After driven to operating temp it is about up and down +- 100. While driving it feels as if the engine is stumbeling/jerking when driving at a constant speed. If you let off and press the gas it feels it clears up. I had the tps changed by a local Mechanic shop. After it was changed now when I start the truck, it wants to die and drops down to 200 rpm for about 5-10 seconds, then catches and idles up to 600. Lastly, the engine will seem to be running smooth/normal, if you press the pedal about 75% or so as if in passing someone, you will notince when you come to a stop, it is ideling with a horrible miss like thud, thud, thud, thud... but still at the normal 600 rpms. I have to rev the engine up to about 3500 to 4000 and hold it there about 5 seconds or so and it usually seems to clear it back up again and idle real smooth.

Items changed/work done has been
All plugs and wires, cap, rotor, air filter, fuel filter, EGR, ERG position sensor, Idle Air Control Valve/motor, and the TPS as mentioned above.