sounds like you have a fuel misfire to me. but before i jump the gun, make sure you check spark for all cylinders.
do this by taking the spark plugs out, connecting one at a time to each spark plug wire, grounding the spark plug tip and cranking the motor (they also sell spark testers at your local chain auto parts store, this is much safer and they are only a few bux usually). you should get a strong blue spark from each plug.
if you have strong spark, on all cyls, then id lean toward a bad injector seal, or injector clip. you can test the voltage reading from the injector clip and the resistance of the injector itself.
i dont have the link to cygnus on hand, but a quick search should reveal it.
good luck, hit back with any results!
