I have 88 wrangler with a 4.2 and 5 speed. Basically the jeep runs and drives perfect when cold and at operating temp. But after maybe a few minutes once it’ll get going the car starts slowing itself down, kinda like if it was engine braking hard. I have to give it a lot more throttle to even get it moving from a stop. In-between shifts it’ll slow itself down and lose speed and rpms. It won’t make it past third gear and with any amount of throttle rpm’s won’t go up in third. Now the part that’s really confusing me is if I pull over for maybe a minute or two after this happens it’ll start driving even better than before. Shifts feel smoother, pedal response feels better, rpm to mph is better. It does not overheat at all. I’m leaning towards something with the breaks? The PO change out the MC and did mostly the entire brake system. Any one can help me diagnose this or maybe give me some ideas on what it might be. Please and thank you!