First thing to do on this car is build a reader to pull the error codes from the engine computer. Costs less than $10 in parts from Radidio Shack. Search the forum for "Arthur Dalton code reader" to find the parts list (with part numbers!), schematic and how to use the silly thing.

Got any maintenance history on the car? What repairs/tuneups have been done in the past, and when?

Pull the codes and post them up. Without error codes there's nothing to be done but guess.

Per Suginami, you have either a 300E or 300E 2.8. Doesn't matter which, engine is essentially the same in both.

- JimY