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how can i fix my 52 plate vauxhall astra?

number 4 valve diagnosed as not firing, tried putting cleaner in fuel, swapped number 3 and number 4 spark plugs over this made problem worse. is it the coil or is there something else i could try.

cheers
jc, October 2010
spark plugs/leads/coilpack/mechanical fault some of the causes listed

GHOST, October 2010
link Click here to see other fixes for Vauxhall Astra.