1fz-fe not running properly

[105series7000]

G'day legands, I've been having an issue with my 1998 dual fuel converted 1fz-fe 105 series. When running on LPG it runs fine unless I put the throttle all the way down very quickly, If I do that then it goes into what I assume to be limp mode for a few seconds. It normally comes right after that, on petrol it does this but it's significantly worse and sometimes just happens while driving regularly and even when going extremely slow on the throttle. I have replaced the fuel filter, spark plugs, coil packs and plug leads and still no change

 

[Shayne]

Shot in the dark from me but I would assume the petrol Cruisers also have a fuel strainer sock in the fuel tank which can get clogged up restricting fuel ?

 

[thelal]

Really need to get it to an LPG shop to run diagnostics to see whats happening under throttle.
What LPG system. How old is it. When was last LPG service done? Know what was changed?

I've a BRC 5th gen on a 97 80