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[martin42]

driving back from the gf's in northampton,over took a lorry and engine went into limp mode,missing like hell,got her home into the garage,turned her of,fired up again and no miss fire,checked back box and the hair had blocked up exit pipe,so new back box need 
would this cause the missfire as i was using kickdown just before this happened...

[TheBoy]

Not a misfire, rather a lack of power

[martin42]

checked fault codes and said missfire on 4 and 6,but runs ok now,bloody cars,just dont need this at the moment 

[Entwood]

Restricted flow of exhaust gas by the "horse hair" will cause a significant back pressure at the cylinders, so giving a mixture of fresh air + fuel as well as the "old" cylinder charge that is now "exhaust" gas.. containing little oxygen..... thus a marked reduction in power ... this would be worse under "kick down" as you are requesting maximum power ...

HTH 

[martin42]

it does,thanks guys,just need a rear box now