just put new spark plugs in my cossie. burtons recommened champians but since i have put them in the car it has developed a bad miss fire. really bad!!
what spark plugs can anyone recommend to put in. the car is running approx 340bhp.
thinking of putting motorcraft plugs in but don't no what ones are best. anyone can help that would be great.

 

071c motorcraft,

or the iridium equivalent

 

Gap them to 0.6mm mate if you havent already.

 

Denso iridiums.

 

I never had any problems with NGK BCR8ES, a fiver from Halfords on trade card.

 

denso iridiums in mine runs sweet

 

Denso ik31 irridium, just be carefull not to touch the tip when gapping as it will break off.

 

Same as above. Think I used 0.6 opening or something, don't bet money on the gap tho

 

Densi ik27's in mine

 

mine nippondenso K24-PR-ZU,platinium and 1mm gap ,the car run perfect!

 

I've tried PP8's, NGK BCR8ES's and Denso IK31's in the past...

...I had lots of problems with the PP8's, no problems whatsoever with the NGKs, and the Denso's were awesome, although expensive compared to the NGK's. Worth the extra?... not sure...

 

Denso IK31'S on mine.