What would be my problem if it squeals at engine start up and then goes away?

Hello, squealing at start up from the engine area is almost certainly from a drive belt slipping on one of the pulleys - either due to a very worn belt or due to a pulley that is not turning as it should. There could also be a pulley alignment issue, but only if work has been done in that area recently. Spraying water or soap on the belt initially may prevent the noise from happening - which would tell you at least that's the source. Then you'll need to drill down to find out the root cause. Use this link to find some shops near you that can help with your concern: www.repairpal.com/repair-shops