Hi
After reading your posted message of today I think your problem might be different to mine experience. On my vehicle it would, under load, rev to about 2k then hesitate for rather a long time before steadily starting to rev again. It would then rev to the maximum with some effort. As I said previously, the problem was the air temperatre sensor below the plenum chamber. It is located below the intakes of cyclinders 1and 2 not as I stated before. I cleaned the sensor, checked that there was some kind of resistance and replaced it - all now appears to work fine. While doing this I looked inside the plenum chamber - it was absolutely caked in thick grease. I cleaned out as much as possible - not an easy task to do well. Also the plenum chamber is not easy to remove fron the head as it fouls the bulkhead. I did contemplate removing the studs which hold it place but thought better of it. Needless to say the car is running again and sounding OK.