Sounds like a problem i had recently. Turned out to be a dead coil.
There is a way you can test them easily.
With the car running, unplug the fuel injectors one at a time. The engine will obviously run differently when you unplug one. but if you unplug one, and the engine doesnt change, you know that is the cylinder that is not firing. So check the plug first, and if it looks ok, it is most likely the coil. I think they are $85 at subaruparts.com.
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`92 pearlie 220k
Tranny Cooler, shift kit, stage 1v4, d/s rotors, axxis pads, Perrin Pulley
'00 GMC Sonoma ZR2.
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