Technical backfiring and vibration

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Technical backfiring and vibration

gavin6015

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Joined
Jun 28, 2012
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26
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Location
derbyshire
my car just started backfiring and just doesnt sound good at all, there is a small vibration which comes now and again, mainly doin around 40mph, i changed the sparks, leads back in april, i just dont know where to start, iv looked on internet but not any better off. back of my exhaust got a poppin sound, my engine sounds like its all over the place and just dont seem to have the power, its a great car over all even though it failed MOT just on welding on sill and the back arm, another thing as well the car seems to keep wanna over heat all the time but the fan kicks in all the time to keep it cool, the fan kicks in every 2 min or so?
 
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