rcranston3

How long a burn did you need? Mechjeb will split the difference on burn time so if you have a long enough burn it could technically try burning close to your retrograde. You'll notice a manuever node is relative to the exact vector for that manuever node. If this is the case you will probably have to do several burns to make your orbit more eccentric before making a final burn to escape. You have to do this using a nuclear engine especially if you have a very heavy craft.