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I don't think you have a O2 or frequency valve problem. That system isn't suppose to be able to cause enough difference to be noticeable by the driver. It's strictly a fine tuning system.
I do agree that it sounds like a lean problem. Have you looked at the injector spray patterns. It should be a very fine spray at idle and increase with movement of the air meter. A technique for doing this is to pull out one injector and slip a 3 ft. piece of clear vinyl tubing over the end. Stick the other end into a 20 oz. plastic soda bottle. Then you must plug the hole in the head. I use a black rubber plug I found at the hardware store where I bought the tubing. Start the engine and observe the spray. Try revving the engine a little also.
Alternately, you can test all 4 injectors at once by pulling them all and installing tubing and bottle on each. Instead of running the engine, pull the main fuel pump relay and jumper the two connections to the pump on the socket ( I forget the pin numbers ). You can then vary the flow by moving the air meter by hand. The advantage here is you can tell if the injectors are flowing the same volume by comparing the fuel in the bottles. You can also check that there is no leakage from the injectors when the air meter is at rest.
If you find a problem here, try some fuel system or injector cleaner. I use a 5 gal. gas can by disconnecting the fuel pump inlet and running a hose to the can. This concentrates the cleaner into only 5 gals. instead of the hole tank. I also let the system sit over night with the clearner in it before putting fresh gas in the can and flushing the system. I did this with the "alternate" setup above and you could really see the dirt in the bottles. My car had 280 kmiles.
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