Coils don't like damp or oil - pull it and see which it may be. They also just fail with age.

 

Got to work OK but halfway home the RS warning came on. No, erasing the codes isn't the issue, the engine is missing badly, hence the reduced performance. Off and on I got a flashing Chk Eng warning as well his time. When I got in the driveway, I plugged in the reader:
1. P304, cyl 4 miss (might be P0304 or 1304)
2. P1313 Misfire, Cat Converter damage
3. P1316 Injector circuit, IDM codes
4. P0354 Coil D
5. P1111 intake air sensor intermittent high voltage.

Coil D must be associated with cylinder 4. I suppose I could pull the cover and see if the wires and/or connectors are tight. Beyond that I have no idea.

Will trade for Subaru Baja or Ford Transit.

 

Why not fix it? Sounds likely to be trivial if done soon.

 

Turned out to be easier than I thought. The first code was the clue: Coil #4. The shop replaced it and the following codes were symptoms of the original fault.

Coils cost $125. Putting them in is extra.

 

Great, good news, and sometimes even bad spark plug(s) can generate dummy codes too.