All I did was change the spark plugs. Checked connections and all is good. Now…I have a miss and no codes. IDEAS?

 

Clean the coils where they slide over the spark plugs.
did you install AC Delco 41-103 iridium plugs??

 

I’m not sure if they were ac delcos

 

Ngk

 

There’s your problem! The Ecotec 2.2 was developed around the AC Delco 4-103 iridium spark plug. Sorry you either got told differently at the parts palace counter or succumbed to the these fit and are cheaper pixies!

 

Ok, boy finicky cars. I’ll change them u today and reply back thank you for setting me straight with the correct information

 

Still have the old ones? They're normally good for at least 100K. But since you need to replace, might as well be brand new AC Delco 41-103 (iridium).

 

I’ve seen them on Amazon and at Rock Auto

https://www.rockauto.com/en/partsearch/?partnum=41-103

If you’re old ones are under 100k miles, put those back in, make sure that the little electrode is in place and don’t try to gap them!

 

What does "I have a miss and no codes" mean? If you don't have a P0300-P0304 you don't have a misfire, unless the crankshaft sensor is not calibrated.
The computer sees a variation in the crankshaft speed as a misfire. Has your crankshaft sensor been replaced with no calibration done?