hi

with a dual fuel ef 4.0 what causes a car to sometimes not all start slow/uneven then run rough on startup for a few seconds when starting on lpg.

havent tried on petrol

put a head gasket sealer Liquid intelligence) in and followed the method that was given and theres now not as much moisture out exhaust running on gas even after stopping and there was nearly always moisture before but only put sealer in yesterday so probably got to give it time

would it be a sticky valve and ifso is there something you can buy that frees valves and lifters

or would starter motor be on way out

has anyone got ideas

thanks