Knocking and idle when al4 dpo heats up

Dear friends, my vehicle is 2001 model peugeot 306 LPG problem: the vehicle runs smoothly for the first half hour, but when the temperature exceeds 90, the power loss is knocking and backtracking on the takeoffs. The gearbox has just been revised, how many masters have I gone to? Can anyone who has found a solution like this give an idea?

If it is normal before the warm-up, the post-warm-up protection mode will be active (if it exceeds 118 degrees). This may cause similar problems, but yours seems more like a valve malfunction. Get the AL4 fault codes by connecting it to the Peugeot fault computer (PP2000). When the F6 key is pressed on each fault code while in the list of faults, a detailed error breakdown is displayed. Take photos of them one by one and add them here so that a more accurate estimate can be made.