: '01 DTS Misfire.

03-28-12, 08:18 PM
Hello, so about a week ago the car started to run rough while cold.

then the chck engine came on.

It was a bit low on oil (bottom of dipstick)
I topped it off and did an oil change the net day.

The code came back as a PO303 (#3 misfire)

so.. I had swapped the coils, it stayed on #3
swapped the plugs, stayed on #3
swapped the boots, still on #3
swapped the injectors, still on #3!!!!

don't notice any vacuum leaks, and is pretty much only while engine is cold

any ideas what to try now?

thanks for the help

03-28-12, 10:14 PM
Please do not double post. It just confused people and is hard to keep track of when trying to help you.

I answered in your other post.