2001 Chevrolet Venture lack of power, misfires

2001 chev venture van 3.4L
A little hesitation when accelerating from dead stop.
When accelerating to highway speeds, especially uphill, there is almost no power from 3rd gear up, about 30 mph up. No knocking, or obvious missing.
Gumout and Techron have both been used, Gas filter replaced.
No codes. Everything remained the same.

MAF sensor cleaned and throttle body cleaned.
Got slightly worse.
Now misfires recorded on all even cylinders especially bad in cylinder 6.

Ignition coil Packs? Or are we missing something else?