My Indi has a car with a M103 2.6 that has no power at 4000rpm or above.
It runs fine until it reaches 60mls/h, below idle and acceleration are fine.
In neutral it revs fine until 4000rpm

Cleaned cat, not plugged
Valve timing is ok

He changed the following parts (most from his spare pars collection)

• Ignition coil
• K- Jetronic computer and fuel distributor
• Fuel filter

Any ideas?

Rob