Okay, just went out and checked the codes, cleared the codes, disconnected the battery for about 10 minutes and re-started the car. Same thing! Evidently, disconnecting the battery didn't help.
Here's the codes: P0102, P0113 & C0561.
I'm still puzzled as to why I would be getting these codes just from disconnecting the battery - or, could it be related to unplugging the electrical connection when I changed out the fuel line?
Anyway, would be great to get this resolved.
Thanks, Rich

 

The first 2 have to do with the MAF sensor, is it plugged in? If so, you could get some MAF sensor cleaner, remove the sensor, spray it down really good, let it air dry,and reinstall.

 

C0561 could be a connector issue

https://www.engine-codes.com/c0561_chevrolet.html

 

Eureka! Issues solved and corrected!
You know how it goes when you've been working on a job for a few hours and you're finally done with it? Well, here's a great example of checking EVERYTHING over before you're finished. Went and checked the MAF plug-in connector - yup, there it was hanging by itself. Plugged it in, disconnected, reconnected the battery and the codes are now gone. Everything as it should be.
Thanks for all the comments on this. IMHO - this is the greatest car forum on the web! Rich

 

See most times you don’t need to be throwing parts at a problem, just make sure you button everything up!
now keep it clean and drive it often!!

 

What does service ESC mean

 

Electronic Stability Control.