last week i finished my 60k service, replacing the fuel filter (300zx), pcv valve, spark plugs (oem ngk's), tightening the throttle cables, and cleaning the tb. the throttle body was really dirty, so i sprayed a lot of cleaner in there and wiped out as much as i could. after this i took the car on some longer trips, 60 miles and then 100+ miles. halfway through the second trip, the car started hesitating on part throttle and idling really rough, and pumping out some white smoke. it struggled through the last 50 miles, but then ran ok the next day and another 200+ miles after that. i assumed that some crud had gotten knocked off when i cleaned the tb, and it had burned up. however, today my wife said suddenly it was much worse, almost dying with quite a bit more smoke and the smell of gas (she's out of town with the car). anyone have any ideas what could be the problem?
side note 1: on the first trip we had problems on, the a/c suddenly started draining water (i think it's water) onto the passenger side carpet.
side note 2: the car has popped codes 0705, 0903, and 0304 on and off for almost 2 years with no problems until now.
side note 3: over the past 4-6 months, the car has cranked a couple extra times occasionally while starting. i thought my battery was losing juice.
i know this is long, but i wanted to list all possible symptoms.

thanks for any help.

 

Well, I will assume if it only happened after your tune-up you should look into exactly what you changed. If the car ran fine you can elminate the air filter and the spark plugs. You properly cleaned your throttle body you should have seen some white smoke and some few drop of water coming out of your exhaust as the car burns are all the dirt. I will assume it has something to do with your fuel filter maybe too much pressure. ? I just went through a tune up and spent 700 bucks getting my car to run fine again but I just get screwed a lot!