bought some new spark plugs a month or so ago, everything was fine, then my car broke down about 2 weeks after i put the plugs in, nout to do with them, my coil pack had packed up so had to get a new one, since then i've lost power around 2,500 rpm and 3,500 rpm? with my foot down it just doesn't want to go. then suddenly after about 3,500 rpm it will pull as normal? seems to be doing it more obviously in the higher gears, but its a pain. i've herd this could be the spark plugs incorrectly gapped? or could it be to do with the new coil pack? any ideas would be appreciated!
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