Having issues, especially driving up hills. First thing I did, changed upstream O2 sensor (was giving a code for that too), and replaced plugs w/Delco Iridiums. Didn't seem to help much, though less CEL. Changed the plug wires last weekend, wasn't sure of any improvement. But after a week, I'd say some improvement at least, but still getting this code. What to look at next?

Check fuel pressure.....pump may be on it'* way out.

Yup. Fuel pressure is next on the list.

I haven't had a chance to change the fuel filter, so there'* a possibility...

misfire with load in overdrive, check coils.

This thread was over 38 months old when a new post was added. Moved that post to https://www.gmforum.com/pontiac-168/...isfires-312890 and closed this thread.