Just thought I'd bump this as I feel the post is relevant. Been using my car for the last couple of days, first time in weeks I've been able to drive it and I felt that on a cold start it would feel sluggish and hesitant, similar to symptoms described in here! Did a bit of research online which I got some possible causes from other Honda forums, mostly people who have B18C4 conversions into other Civic's and somebody said to unplug the lambda/O2 sensor and drive the car from cold, which is what I have just done! Felt so much better! Smooth as you like, EML came on but was expecting that but much better throttle response low down and much better to drive while she warms up ready for some VTEC action! So based on that I believe a new sensor should cure my problem. Hope this helps a few of you who are also suffering the same!