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sound like the ignition timing is out and needs resetting so that it fires at the right part of the 4 stroke cycle. usually about 8 degrees before top dead centre. varies for each model of engine
What bolt is missing on or in distributor as if outer bolt holding distributor on to the engine this will allow distributor to move and your timing will move so the engine will not start or miss fire and can cause a blow back through the carby and a FIRE so get it checked now.
Got a check engine light? Get the codes read to find out if the misfires are on all cylinders or just 1. Could be ign coil, bad crank or cam sensor, or a valve issue
remove the plug from the #1 cylinder, and install it into the #2 cylinder , and put plug from # 2 clyinder in to #1 plug hole, connect plug wires, and start up vehichle, and if computer shows misfire on # 2 cylinder , then you have a bad plug, possibly porcelin insulator could have a hair line crack in it, hope that this information has helped you.
the engine miss fire can cause the other codes to set. you need to repair the miss fire and clear all codes after the miss is repaired then see if the 02 sensor codes return. the miss fire is probably a bad spark plug wire a good tune-up should take care of it ........HAVE A GREAT DAY
if you have a pd engine and you say that it miss fires i would change the wire loom to the injectors if it persists the air flow meter is on the blink, has you car ever gone into a limp mode status were you couldn't rev then check your turbo ,this may sound strange but just had a 150bhp tdi which was remapped with a very simular problem
Matter not whether plug fires out of engine. Put it back in and clamp a timing ligh to it. If the light won't fire, you don't have enough spark to fire cylinder, hense miss.
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