1999 Renault Megane misfire

If its multi point injection it could be a stuck injector?

It`s a long shot but try swapping spark plugs on no;3 cylinder. Faulty plugs aren`t common nowdays, but worth a try

im not sure if its multipoint injection or not.when i tested for fuel took of ht leads, of each cylinder and plugs are wet so getting fuel to em,tryed swapping plugs fault was same so put new ones in and the new coilo ony thing not new is leads swapped em round fault stays same cylinder so sure its not leads

had a look at car it has injectors on it,r they difficult to change?would chucking some injector cleaner in tank maybe shift it?i bought car as cheap run about so dont wanna chuck loads of dosh at it?also cleaned out air filter and breather from cam to filter box, this pipe bout an inch thick.there is also a pipe next to it that is about 1/4 in thick that goes to intake under air intake at bottom of what looks like carb,this pipe had a small barrel shapped piece of metal in it?the pipe was totaly blocked no air passin through it.pin hole size hole down the middle of it ,used a safety pin to clean throu it ,then put it back in pipe,it now vacuum's back to injector side?is this normal or has this metal piece escaped from cam shaft?seems highly unlikely .what does this pipe do?is it to feed more air as engine gets faster?if so shud the metal not be in.