Just before heading off to Goodwood FOS….
 

A few days before heading of to the great Goodwood FOS 911T 2.0 with weber 40IDA started running tough. Also dull popping in exhaust. Still running on all cilinders.
Today started her again, same story, rough through whole rev range.
To see if there was one cilinder misbehaving I measured the temp of separate headers.
1-2-3 were significant cooler then 4-5-6.
So carbs, right!?
Strange though if it is fuel(delivery) why whole rev range. Going from idle jet to main jet…..
Will pull carbs however all input is welcome!

Thanks,
Bart

Pull the plugs first and clean the idle jets.

thanks, will do those first!
(maybe bit to enthusiastic/disparate to pull carbs apart already)

Follow-up:
Pulled all 6 idle jets and as clean as possible, also all 4 fuel screens on bajonet bolts are fully clean!

As said, bank 1-2-3 was while warmed up on exhaust tubes +/- 50 C cooler than side 4-5-6. Engine was running rough and dull popping. Started within 20 minutes drive..
Could it be shifted cam timing as it is a whole bank 😬
Any other suggestions?

Regards,
Bart

Worn throttle linkage for the carb on the 123 side?
Maybe check airflow side to side with a synchrometer.