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[FRE07962128]

Errr No........

Nice to see you again Kate  

But a blowing exhaust doesnt cause missfires......

I beg to differ, a faulty centre exhaust can cause rough running that may feel like a missfire, I experienced this some time ago on a Matra Ranho. As soon as I replaced a length of centre pip it was fine again.

Nice to hear from you again Kate

Glad you said that Mike, as I seem to remember a u/s exhaust on one of my cars causing bad performance / misfire seemingly.  

I am sure that a faulty exhaust does change the pressure balance of the engine and effectivly "choke it" by back pressure and thus effect the firing of the engine. :-/ :-/

As for the Cat question Kate, if I recall correctly most cars, if not all, HAD to have cats fitted if registered after about August 1992.  I know that my 1990 Senator, and those registered up to July 1992, were the last were if I wanted to I could have erradicated the cats and still passed the MOT.

Your Polo therefore I am pretty sure will have a Cat fittied.

[Lazydocker]

A very common failure on those is the coil... Really easy job but bl00dy expensive part  

Have someone with a coil tester check it for you... Most places will do that for free

As a word of warning... If it is the coil failing it may not give you much warning before it dies completely

Sorry to put the frighteners on there but wanted to warn you

Nice to see you again Kate... Keep smiling

[Kate]

Thanks for all your help.  I'm sure I'll get it sorted out now.