Your misfire is caused by dirty distributor, disconnect the filter hose and pour some injector cleaner, leave for few hrs or overnight and this should sort the issue or strip down the distributor and clean or rebuild. Don't play with adjustment of the pressure, there is to hex bolts, one on the bottom and other on top. You need manometer to adjust the pressure and car has to have over half a tank of lpg, normal operating temp and ideal around 21C outside. Volvo has a special tool to check the pressure but manometer can be used as well
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