Rough running

Hi all,
I have a '92 RRC 3.9 V8 that has recently had a head gasket.
Since, it runs rough on LPG and petrol. Idles ok but struggles under revs?
I've checked all the obvious ignition, fuel supply side of things and everything appears to be ok.

Any ideas?
Thx

genuine dissy cap rotor arm and leads first also a ecu fault read and a basic tune/setup would be the first thing and a check over

My guess would be check your ignition timing but like voguese39 said genuine cap, leads, rotor arm are essential!!

One other thought, you might have an induction leak possibly, although that might more often be associated with the engine starting but then stopping after a couple of seconds.

If it wasn't for the same problem on LPG I might also say check your fuel level but it sounds like a timing problem. If memory serves you want 5 or 6 degrees btdc. Do a search I have posted timing settings before.