I know this is an old post. My wifes 2004 plate 1.4 CVT is now exhibiting the same symptoms as the OPs. It only momentarily hesitates at around 1500 - 2000 rpms under light load in "standard" CVT drive. It runs fine in 7 speed or full manual mode and will rev cleanly to the red line. Ive had the EGR off overnight for a thorough clean ( it was replaced under warranty when the car was surging but this was 12 years ago ). Both banks of spark plugs were replaced about 2 years ago. Any other possible culprits apart from these and the coil packs? Thanks.