2002 shakes on startup, engine misfires p301

Hey guys!

my 2002 is having some issues.
Does that shaking thing for about 15-30 seconds then it stops.

I had a multiple engine misfire code p301

down stream 02 sensor was changed about a year ago, just changed the upstream 02 sensor today.

Drove it around the block and no more issues.

On my way to work I could feel a slight stumble or hesitation when I was giving it more gas. Then the check engine light came back on.

Drove the next 20 miles with zero issues and the mpg gauge was around 45-50 the whole time.

Things I haven’t changed:
-coil packs
-fuel injectors
-PCV valve

Does the 1st gen have an EGR to clean?

I have no coolant on the spark plugs or coolant consumption. My oil is not “milky”