I'm getting a P0300 and P1800 code FLASHING. The SES Light flash only. It didn’t stay on in the dash, it flash only. Car runs like sh*t. Anyone have any additional troubleshooting ideas?

Here's the sequence of events:
1) Removed intake
2) cleaned TB
3) Removed spark plugs and replaced them
4) Did a compression check ~180 on all cylinders
I replace all 6 coils because of code P0300 but didn’t change anything
5) Installed plugs
6) installed intake
7) started up and ran like a charm immediately

10) took a quick drive and got the P0300 and 1800 code with noticeable power loss. Like if it runs on 5 cylinders....
+) Checked for vacuum leaks - OK
15) took a drive and same P0300 and P1800
I replaced the VIAS solenoid but still got the P0300 and P1800 flasing SES light.
Sometimes the car drives like it should be like a charm but i notice that if the car is cold first time i start it in the day, i get the flashing ses light code P0300 and P1800.

Every time I take it for a drive I reset the codes. Shortly down the road the check engine light blinks but then disappears when I idle. The FSM says this is caused by excessive fuel going to the CAT. Also, if I reset the codes and just let it idle for about 10 minutes no new codes will come up.

I've ZERO engine mods to speak of.

Need help please

 

You may have an issue with the VIAS wiring, or you need to do an ecu reset.....Or you bought a defective valve.

 

well, right now i do not have any code, only bouncing rpm...i replaced the IM gasket on the plenum. Any idea?