⚠️ HELP⚠️ MK6 Golf dancing revs

[EllaM42]

can anyone help? I'm having some issues with my mk6 2ltr tdi vw golf. For the past month or so only when driving and only gears 3,4,5 my car seems to fluctuate power. The revs dance up and down and it happens when reaching 2-3 thousand revs. It doesn't cut out, stall or jutter but it isn't consistent with power. It has a stage 1 remap and egr delete. Recently had a full service and timing belt changed 2 days ago. And after doing the service and timing belt the coil light is now flashing and my engine won't start first time. It will start 3rd time.

Before service no lights displayed but still had the same issue.

Thank you

[Crasher]

You need a fault code read, the flashing coil light indicates a code(s) is stored.