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There are already quite a few threads about the P219A/P119F combo, I've got it on my 17 '86.
The short of it is, those a/f ratio imbalance codes are mini misfires, because the car detects them when the engine speed between cylinders varies beyond a certain (very sensitive) threshold. In the 17-19 cars, they are caused by valves being slightly too tight, it's a silent issue that usually results in intermittent MIL illumination.
You car sounds like a rocker arm or lifter or valve shim took a crap. This isn't some stale gas or too low of an octane rating, this is the sound of mechanical parts failing.
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