Hello everyone,

I have a 98 GTB BH Rev A.

Currently having problems with poor idle when it's cold.
Doesn't stall, still boosts good. Has quite a few km on the clock (240k).

Sounds like it's having a miss fire every so often. However, this only happens when the engine revs drop after warming up for a few minutes (and not up to operating temperature). This happens less when the AC is running.

Any tips on how to go about diagnosing the issue?