That connector goes to the mass air flow sensor. While the engine may start without it, and may even run for a while, it will not run well or for long without it. That is the main mixture control sensor. If the engine runs at all without it, it is only in a "limp" mode. Just my opinion, but I think those K&N filters are a waste of time and money. The improvement that they will make in airflow is more than offset by the computer programming in the PCM.
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Today's Featured Article - Farmall 460: That's My Girl - by LeAnn R. Ralph. How many sounds can you think of that are as familiar to you as your own breathing? What about the hum of your refrigerator? Or the thump of your clothes dryer? Maybe the engine of your car? You hear those sounds every day, and you don't think much about them, do you. I can think of a few common, ordinary sounds in my daily life, too.
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