Kathy,
I agree with Brad.  I have a Toyota Carolla 1993 which has 195,000 miles on 
it.  My son hit another car in the rear back in August and since then I have 
had many things go wrong.  It messed up the hood on my car, pushed the 
radiator back and who knows what else.  Anyway, I have refused to let it go 
and have spent about $1200 since then after spending about $ 400 in the 
summer. Many vehicles cost their owners that much and more long before the 
vehicle has nearly that many miles on it.  I believe it has another 50 to 
100 thousand miles on it and pray the Lord will permit it.  Your van, 
troublesome though it has been, may have just needed the maintainance that 
you have now given it and with a new engine might take you another 50 
thousand miles or more.

Praying God's wisdom in the matter.

Ned