CEL 1/4 light

Okay, may be nothing but.. Last weekend had a great day 150 mile round trip excursion at times "at speed" what a great car!!! Got in yesterday for a short run, as always started right up. While warming up the CEL1/4 came on briefly so I shut the car off and then restarted, light went out. I then went a couple of miles, stopped for an errand about 20 minutes, started fine....drove 10 mintues back to the house to drop off something left it running and there was a slight "chug" while ideling, revs dropped to 800 then 1200 and back to 1000 and steady. Did this once or twice but went for another short drive seemed okay. Shut it off for about 10-15 minutes then had trouble starting, took a few tries which always is frustrating but it started up and I took it home. Both if these things have happened before (CEl flashed on and then stayed off, and the proverbial hot start issue). Haven't driven yet today and I figured I would let it idle a while to see if the revs run up and down or stay steady. Other than this the car has been fantastic to own and drive. I know this is a little vague but any ideas why the CEL and the little burbles in the idle seem to come and then go away? The last time I just pulled the connectors and re-seated them and it was fine....

 

gauge numbers all seemed okay within range. the cel came on first of course when it was started but the stops were short enough that the oil and water temps were still good and the pressure and levels for oil wre spot on

 

Okay, so this morning I go out to the garage and unclip, clean, and replace the 1-4 connectors to make sure they were seated properly. Started up no CEL light, okay fine, let it warm up, idle is steady, took a short drive around the block and I look down the I see the orange light, but, this time it the 5-8 CEL light. Now this is new... never had this one light up. Car seemed to ride okay but I went back home to scratch my head. I didn't swap anything so not sure why it jumped to the other side...?? Any thoughts?