I have a 1994 Integra RS with the following problem:
Although my car performs very well, the check engine light comes on approximately after every 2 minutes that I drive off with the car. The check engine light won't come back on if I pull over to shut the engine, restart it, and drive off. This has been happening since I replaced the radiator about 6 months ago. (At that time, I over heated the engine by driving the car for 5 minutes without any coolant.) From this, I've also noticed that the coolant gage needle will slightly move at random.

Could someone help?