How many miles are on the vehicle?. How long have you had it? Have you done all the needed maintenance as outlined in the owner's manual. Particularly, has the transimssion nfluid and filter been changed at least twice? Please tell us what you actually HAVE done since you got the van. What is the current condition (body and general)?
When not regularly maintained, these models have been subject to transmission failures and head gasket problems as a result of overheating.
Your answers to these questions will determine what the experts on this forum will recommend.
Many non-technical owners are very frusted when an older car starts acting up. You need to find a trusty and competent mechanic; get advice from friends who know cars.
If you decide to get another car, you don't need to buy a new one. For half the price of a new one you can get a very good used one.
Your current Windsar is not that old, but these vehicles were not sterling examples of quality and reliability.
A friend of my wife is a widow and her Dodge van is starting to show its age. She is 74 years old and will soon trade it for a 4 year old car with low mileage. I will help her buy it.