Engine loses power

No, I haven't checked the converter. I remember a while back a mechanic that was working on it told me I had 2 fuel injectors going out. I suppose the converter could be part of the problem too.

While I am driving down the road sometimes my Jimmy will lose power. I let off the gas for a second then when I push the gas again it does fine. It usually does this around 35 mph then a 2nd time at around 45 mph once I get above 45 mph it drives fine.

Thank You for your quick response. I took a gamble and changed the throttle position sensor and that solved the problem. Because of your quick response I will use you guys in the future if I get stumped on something.

1989 GMC S-15 Jimmy. 4.3. Car was given to me because it was sitting in the woods. When the owner parked it, it was running rough and very rich. What I have done, ALL NEW plugs, wires, cap, rotor, map sensor, coil, temp sensor, complete exhaust from manifolds back, O2 sensor. Rebuilt TBI (seals, gaskets and filters). Removed and cleaned gas tank, lines and new filter. Compression check showed a HIGH of 159 and LOW of 151. Oil pressure by gauge is very good. Still runs rich. Will start and idle, when it gets a little warm if you touch the accelerator at all it dies. Will start back up if you hold pedal to the floor and blows black smoke and runs really rough but will idle after. I am lost. Have been out of work for a year and any help to keep me from paying a shop is GREATLY appreciated. Mike

Fuel return line is not restricted. O2 sensor is new. Fuel pressure regulator is new.(Forgot to include in post) How do I calibrate the NEW temp sensor?

What is "the CTS"

Coolant Temp Sensor? Are you refering to the one in the intake manifold or the on in the block?