After driving over 60 for about 15miles the car dies down to 20 and then u can drive it at 55 with no problems

There are 3 leads on the remote box red goes to battery, black goes to battery the 3rd wire is red I believe it’s the power source where specifically does it go?

It has new battery and crankshaft position Sensor and it started after putting in the sensor but stalled out at 40mph quarter mile from home I had it towed and all it does is crank over but not start