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with not knowing what engine is in your vehicle its not easy to answer but normally the plug gaps can stay the same has a gas/petrol engine normally 1 to 1.4 mm if you have got the owners manual then use the plug gaps in the manual a slightley larger gap can give a small advantage but if it runs ok on standard gaps leave it alone
dedicated gas ( LPG gas only) has no filter as the line is from the tank to the converter direct
what has to be monitored is the converter as they corrode internally and play up
If you have liquid direct to injectors then the injectors have to be serviced as per schedule
Sound like a problem in the LPG system - Take it to a LPG Specialist/Auto Electrician - will save a lot of heartache and probably a lot of money - nothing like advise from someone that knows what he is doing ??? Forget the local mechanic.
I think you need a special long spark plug socket to reach the plugs because the plugs are deep in the cylinder head if hemi type engine, hope this helps!
Check for manifold and vacuum leaks. The problem with LPG units is that the aluminium used in the manufacture if the unit is susceptible to corrosion so this problem may be best referred to a gas fitter specialising in vehicle LPG applications . IT could be a faulty gas unit itself in which case you will only be allowed to have it worked on by a qualified gas mechanic.
do a compression test to make sure it is that cylinder.
once determined it is that cylinder, put a teaspoon of oil in the spark plug hole. If compression comes back then the vave is burnt, if compression stays down the rings are bad
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