Rough running engine - Diagnostic help

[ulfilias]

Hi There,

Replaced the G40 sensor and that error has gone away.

It's not the fuel system as the car has LPG. It runs slightly worse on LPG, which is actually common when you get a fault as it is less forgiving than petrol.

I expected it to be the coil pack on cylinder no.1 but i've just swapped 1 & 2 and there is no difference, if anything slightly worse, though takes 30 second to generate the missfires 1, 3, 4 (2 didn't even come up).

However the 1st code in the list is now

17549 - Load Calculation Cross Check: Implausible Value
P1141 - 35-00 - -

Any ideas ???