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Intermittent running problems Hi everyone, should probably start this off with a bit of background info. this is my back and fourth to work car, i do have a lead foot sometimes, but I don't need it for the power. my r33 non turbo automatic with the RB25DE has been running rough intermittently when it first started I thought it might have been a fuel issue, so changed the fuel filter, oil, oil filter and blew out the air filter i pulled the coil packs out and they were starting to show small problems Problem continued , had to wait a few days to fix that but finally got round to it, cleaned the carby and mass flow, the spark plugs i had thought should be still good since the last service not many k's before but a fair amount of time it drove smooth the next day, then started to drive rough 30mins in the day after. i pulled it apart again deciding to change the plugs, chucked carby cleaner drove the next day calmly, day later ran rough 35mins into drive decided the coolant temperature sensor needed to be replaced drove to and from work smoothly then jumped in to run down the road and it didn't just wait to be 10 or 15 mins into the drive, it ran rough all the way

Intermittent misfiring on rb25det My r33 skyline has recently started intermittently misfiring on idle and while driving. Spark plugs are new, new yellow jacket coil packs, replaced the o2 sensor, and cleaned the maf several times and a fuel system flush has been performed the misfire doesn't sound to be on anyone cylinder. when it does misfire white smoke comes from the exhaust and the coolant level has been going down. Could the turbo be leaking coolant into the intake causing the misfire when it reaches the cylinder? Has this been an issue before?