Hi sorry it took me so long. If you have not figured out your problem yet, here is what I did. Checked coil by switching with another to see if misfire changed cylinders. Checked wires. Cleaned MAF which is just behind the air intake by the air filter. After that the problem seemed to clear up and then came back. When it finally came back to stay I tested the injector with a ohm meter. The resistance between the connectors of the injector should be I believe 11-13 ohms. I used a haynes repair manual to figure this all out. I had tested the injector before and it showed good but the problem was not consistant. I think the injector worked on and off until it quit altogether. the ohm test is done with the engine off. The haynes manual was quite helpful when changing the injector also. Make sure you change the o ring seals also. I found six injectors on ebay (aftermarket) very cheap and I changed all three on that fuel rail. Good luck! let me know if this helps fix the problem or if you find something else. DJ

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DJ