i would stick with the original spec plugs i do in both my p38s ,they run perfect ,however plug leads need to be good quality you dont want to be having misfires on lpg!!Hi folks i know its been asked before but which plug would fit a 4.6 thor 1999 engine on lpg, as ive heard that there are 2 different sizes , 16mm + 21mm hex ? , also been told not to use champion plugs by the firm who just serviced my plg system today. Any thoughts would be great.
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