Tb45 powerloss

Hi everyone im asking for a friend of mine he has a tb45 and recently has began to have a flat spot and feels sluggish. He has just about changed everything but nothing has changed, This issue only happens when the motor is warm or its a hot day.

This is not my car but ill list what ive been told he has changed.

Here's the list ;

Exhaust.
Intake pipe
Injectors
Fuel pump
Ecu coolant temp sensor
Dizzy
Dizzy cap
Rotor button
Plugs
Leads
Adjusted tappets
O2 sensor
Test and adjust TPS
Clean all earth's
Multiple carbon cleans

"Smoke test intake manifold - no leaks"

"Have clamped return line to increase fuel pressure with no difference."

Have clamped feed to lean but no difference


Any ideas would be great

Thanks,

When was the last time the tappets were adjusted?

Sent from my A1601 using Tapatalk

Less than 2000km ago