Just reread post, seems i'm rambling a little, so basically:-
Car-Nissan primera '98 GT Fault- Intermittant Misfire When- whenever doesnt seem temp/'dampness' related, But past 4k with foot down seems to clear. Done so far- new plugs/leads dissy cap/rotor arm
I have a '98 nissan primera GT, which has one of those anoying misfire's. Sometimes i 'feel' it's temp/dampness related, then the next cold/damp morning its fine!! I'm fairly certain its electricly related as its so intermittant. Normally the misfire is at lower revs in a higher gear and once you get past 4K rpm with you're foot down it 'seems' to clear.
It started to happen a while ago, probably a year, instantly i thought on plugs so took them out and cleaned/ regapped. The problem seemed to disapear, then a fair few weeks later it reapeared, so i thought ok the plugs must be on their last legs change them, so i did, and again for a few weeks all seemed well, then again the misfire. OK its not the plugs i thought, but MUST be something else i'm doing when i change/clean the plugs, play with the HT leads!!!!, it must be those thats causing me the probs, so i changed them, and 5 miles from halfords the misfires back!! So i took the dissy cap/rotor arm off and cleaned them, same as teh plugs several weeks and no misfire, once the misfire came back i thought it must be those, so off to halfords again to get them ( mitsubishi dissy etc) , and after two 40 mile round trips to order them/get them and finding out they have the wrong part on their computer i end up at the dealer to get new parts teh bloody car still misfires!!!! So now i'm at a loss really what could be causing the misfire, and how do i work out what it is??
Oh whilst we're here the car has a knackered 5th gear, goes in fine but as soon as you put 'any' power on it'll pop out. I've been quoted £600 for my box to be fixed, does this sound about right?, or should i shop elsewhere? and while the box is out how much extra should i be looking for a new clutch?