Ladies and gentlemen, I have a 93 Chevy pick up. 5.7 L engine. The engine light comes on sometimes (not always) but goes back out usually in a brief amount of time. Found out that it was an oxygen sensor that appeared to possibly be a touch lazy. I recently replaced the old oxygen sensor with the one currently equipped from the local dealership (engine light kept coming on and staying on with the old one). All wires and connections seem to be fine. I was curious if anyone knew if this is typical of these trucks or maybe I have another defective sensor?