Install sone irontite sealer if it slows down the bubbles or they stop seems to be head gasket but consider this a bandaide will get you by until you can take care of head gasket if your doing this yourself have the head surfaced and press tested hope this helps Campoman
Looking desperately for a computer for my 95 Tacoma4x4 2.7 mt any info please contact me @ 6194051635 Al. I have sent it out twice to be repaired both times was sent back with same problem hopeing to find one in a wrecked tacoma