Shudders when accelerating from full stop

I have a Subaru xv 2.0i 2015 CVT. Converted to LPG.

The car is jerking when moving from a full stop.

If I disconnect the battery and reconnect it drives perfect for a day or so.

And then it's jerking again when its about 1,500 rpm and moving from a full stop.

When is write jerking (shudders) I mean the car is jumping.

I did the throttle relearn. And it's the same.

I can not figure this one out and neither the garage.

May one of the computers in the car cannot calibrate itself that which one?

I replaced the CVT ECU and it did not help.
tested the camshaft sensors and got 5v from them when no metal near them when putting a metal its drops to 0v. Remove the metal again it stays at 0v putting back metal it goes up to 5v. So I think its the camshaft sensors but didn't yet replace them as they are pricey $300.00 for a unit and this car have 4 of them.