re: 2.2 JTS hesitation - now with new IMPORTANT information & escalation details
The 2.4 suffers turbo lag (worse in the 1.9) as well as egr valve intervention, however, there is a remap for the 2.4 for the egr. As for the 2.2 JTS, Alfa must maintain the parameters for the certification in accordance to Euro 4. Being an ex-tech I am aware of the problems associated varying quality of fuel. Remapping may fix the problem short term, but you may have issues with the MOT if it does not adhere to the emission limits. The car certainly does run better on 98 RON fuel. In Australia we have Shell V-Power Racing which is 100 RON and has 5% ethanol. I tried it on my 156 and it actually had better low down torque.