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Have a 1998 f150 5.4l truck, and changed my plugs last week, and also the cops.
Problem is the engine is not running smooth,idle is ok, but when i drive at a constant speed, i have a feeling that there is a misfire, but according the odb reader there is none.
So i found out that my local shop ordered the wrong plugs (NGK tr6 ix) which are for CNG, while i drive with LPG.
Could the plugs be the problem ?
Don't like to change them again , because this is a F******* job.