Car starts when cold and runs fine for about 30 min until it get warm then keeps running but has no power will barely pull itself, after it gets cold again it will runs fine again for a few minuites honda civic lx 1.7 engine 2001 model

Try replacing the Engine Coolant Temperature (ECT) Sensor, which affects fuel injector pulse width. The ECT Sensor is a temperature dependent resistor (thermistor), whose resistance decreases as the engine coolant temperature increases. It provides a richer mixture when cold, leaner mixture when hot. They become corroded, due to not changing the coolant frequently enough, flood the engine, and waste a tremendous amount of fuel.