Fjaimo10 Posted September 24, 2018 Share Posted September 24, 2018 (edited) Got a mk4 efi cabby and although about to strip for restoration it has an annoying problem Starts fine and when foot down drives ok even if slightly down on power but try cruise at any speed or gear will jerk badly enough to throw you forward and backward like running out of fuel changed filter, plugs, ht leads etc but no better alot of posts mention get rid of ngk plugs would that cause this Edited September 24, 2018 by Fjaimo10 Quote Link to comment Share on other sites More sharing options...
prox71 Posted September 26, 2018 Share Posted September 26, 2018 check you have the correct gap on your plugs, just had this on mine and I had 08mm instead of 1.1 in it Quote Link to comment Share on other sites More sharing options...
Stephen Bearded Minky Hill Posted September 26, 2018 Share Posted September 26, 2018 first thing I was going to suggest was lose the ngk plugs. When you see the difference between the Bosch fr6dcx plugs you will be surprised. And they really made a difference to mine. They're listed as a replacement in the mk3 fiesta Haynes manual for the xr2i cvh. Quote Link to comment Share on other sites More sharing options...
Fjaimo10 Posted September 27, 2018 Author Share Posted September 27, 2018 Ordered some fr6dcx plugs Also when on chock seems better i think Quote Link to comment Share on other sites More sharing options...
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