I have a 1991 Sierra RS Cosworth 4x4 and it has the following upgrades:-

• 3 bar map sensor
• Stage 2 sue collins chip
• Light Green Injectors
• -31 Auctuator
• Cone Air Filter

But my car is running very lean when it comes up onto boost. I have recenly changed the fuel filter and a full engine service including plugs, can anyboady give some advise on how to cure this problem. Thanks