okay, first off, enough with the raindbows.
when the car is idling under1k, does it shake? i remember mine shook a little and wouldnt accelerate well and it’d idle like crap. run bad in higher gears at lower rpms. i took a look at my ignition and the coil pack had one rusted plug, it ran on like 3 cylinders, but didnt throw a code. i replaced it with a new one and got spark plug wires(i had uhm ractive tucan or something), threw in new NGK plugs and it ran perfect. take a look at that maybe?
i agree with john. sounds like fuel starvation or a clogged cat.