Since you mentioned the flashing OD light, that could lead you to look into the VSS (vehicle speed sensor) and/or the neutral start switch.
Both are covered in the "Related Questions" below
Otherwise, you may be needing a trip to a professional repair shop for diagnostics
Check or change transmission fluid and filter
There are several reasons that can cause your Ford Windstar to jump when you give it gas. The most common reason is a problem with the transmission. Check the transmission fluid and make sure it is at the full mark.
There are pages and pages of things that can cause a check engine light. You need to have it checked with a scantool. Then the code can be diagnosed and repaired.
. It's warning for a automatic transmission problem. (check the atf level (mercon V))
Check all the fuses, check fusible links, exc.
Check the transmission cooler, located in front of the radiator. Flush the coils with a hose to insure that air can flow to cool it.
Have it checked for codes. Then you can diagnose it from there.
It is a sealed transmission it can only be checked by a qualified service tech using the proper equipment .
To find out more information about reliable places to have your transmission checked out you can look in your local classifieds or even in your local newspaper. If there's no luck with that check craigslist.
The 1995 Chevrolet Geo flashing amber engine light is an indication that the engine needs to be checked soon. A red flashing engine light is an indication the engine needs to be checked immediately.
All fluids should be checked when you purchase fuel. All fluids except for the transmission fluid should be checked with the engine off and at operating temperature. The transmission fluid should be checked the engine running and the transmission in PARK if automatic or NEUTRAL if manual.
Hopefully if you are thinking of adding transmission fluid that means that you checked it..If so you are in luck, you put the trans fluid in the same place you checked it. However you have to get a transmission fluid funnel, also you need to ensure that you check it correctly. If you read the dipstick then it should have directions on how to check it. It should be checked in "park" with the engine running.