04pathse wrote: ↑Thu Mar 14, 2019 1:30 pm
an extremely dirty MAFS might cause the issues you are having so cleaning it would be a good place to start, only takes a few minutes to do. Best to use CRC mafs cleaner, some have used dechlorinated brake cleaner to clean them if you happen to have some of that around.
That's odd. I thought I replied to this (but it's gone).
ANyway, thanks for insisting I check the MAF. I actually thought I pulled the connector on this earlier as a check, but I guess I pulled so many that I missed this one. Anyway, it was a faulty MAF. I pulled everything again and as soon as I got to this, it idled perfectly (PCM reverted to default values) and a fault code. I tried to clean and re-install but the condition came back. I'm buying a replacement today.
Thanks again!