Hey guys,

I've got a '96 4th gen prelude.
125,000kms

After about 20mins driving or 15mins in peak hour, as the temperature gauge reaches half way, it starts losing power.

The engine becomes noisy/rough. The temperature gauge never goes past halfway though.

Although it's annoying, it doesn't bother me TOO much but could this be a sign that some bigger problem might happen in the future?

After this symptom started occurring I have:
Flushed the coolant
Changed engine oil (Honda FEO)
Changed spark plugs + leads (Bosch)

Still not solved.

I've also posted this in preludeaustralia.com but I think more people use this forum.

Cheers