stutter, lack of power 90 legacy wagon AT, AWD

A

ascus_lsil

have a 1990 legacy with 220,000 miles
small hole in exhaust
has stuttering, random dead spots when trying to accelerate

seems to be when cold
and when it does makes mileage go poor

any ideas
i checked resistence on coil pack and fuel injectors becuase suspected ignition problem

pcv stuck, but was changed about 10000 ago

too many things to check? MAF sensor? o2 sensor? where to start

oh, when i take out the plugs they look okay
thanks
 
Fuel filter change, fuel pump pressure & pressure regulator, water in
gas, any codes?
 

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