The East of England Ambulance Service (EEAS) said it was working to improve its response times.
Earlier this week MPs met members of the Care Quality Commission (CQC) over concerns about EEAS response times.
The EEAS trust said it understood the pressure crews were under and was working to boost staff numbers.
Earlier this month EEAS agreed to give monthly updates to east of England MPs on its response times.
The EEAS has been under fire in recent months for poor response times.
The East of England Ambulance Service (EEAS) said it had asked for the review "regarding service delivery in Norfolk".
The East of England Ambulance Service (EEAS), criticised in the past over response times, says it is introducing 15 extra ambulances from Monday.
However, in the Great Yarmouth and Waveney area of Norfolk and Suffolk, EEAS did meet its 75% response time from April to November.
Paramedics in the East of England Ambulance Service (EEAS) are being let down by "very poor management", a whistle-blower has told the BBC.
Among all the design flaws that have held back the EEAS, by far the biggest has been to put Ashton in charge of it.
There are some first-rate people in the EEAS. But the stories of chaos in her entourage and despair among her subordinates are worryingly commonplace.
The report, compiled by EEAS director of strategy and business development Adrian Matthews, said performance in January initially improved after the expected dip in the new year.
The East of England Ambulance Service (EEAS) has not met response time targets in parts of the region for the past year, according to a new report.
The EEAS has been created by the Lisbon Treaty to combine the foreign and diplomatic services of the Commission, Council, as well as certain elements of national foreign embassies.
BBC: Baroness Ashton criticised over EU 'diplomatic service'
Last month, the EEAS said it was bringing into use the 15 vehicles to help cut delays, but has now revealed that only three of them are in full-time operation.
The East of England Ambulance Service (EEAS) said that between 11:00 BST and 20:00 BST on Monday there had been between six and 15 vehicles queuing for up to three or more hours.
Unison's EEAS branch Secretary Gary Applin welcomed the increase in ambulances - which require two members of staff - but said he was not surprised to find not enough staff had come forward to cover shifts.
The East of England Ambulance Service (EEAS) said incidents of police taking patients to hospital because of late or unavailable ambulances are not logged - though references were made on call logs if a call-out is cancelled.
Any new organisation is bound to have its teething problems, particularly one such as the EEAS, which incorporates functions that had been performed by several officers, and which must reconcile the aims and prejudices of 27 different countries.
His analysis, "More Action, Better Service: How to Strengthen the European External Action Service" (PDF here) is phrased diplomatically, as one might expect, but its exposition of the weakness of the EEAS is more devastating for the sober tone in which it is delivered.
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