Im losing antifreeze I pressure text fine I don't see any leak but I notice temp go up and down and I cut the car off and I see steam coming from the tail pipe and also the idle go up and down

Im losing antifreeze i pressure text fine I don't see any leak but I notice temp go up and down and I cut the car off and I see steam coming from the tail pipe and also the idle go up and down

If steam is coming out of the tailpipe... you have a blown head gasket or a cracked head or block.