wird unconsistant jerking, jumping.

[snafu352]

Sometimes when I drive me 240sx it will be driving completely fine and the it will jerk and then when i push the gas it does not do any thing, the rpms drop and the motor sounds real dull as i push the gass and after a few seconds sometimes longer never the same it will all of a sudden go back to being perfectly fine sometimes it will happen again and again consecutively, but other time i could go a couple days with out it doing it. It doesnt even matter how i drive even when i take it easy it still does it and the same when i reallly beat it up. Very strange and even harder to diagnos i have tried alot of things but i have not solved the problem yet sooo i am open for new ideas if any has any or experiance the same problem.

[StuntingShaggy]

I only have two systems. One could be an intermittent EGR circuit or similar vacuum circuit. Mine had the same kind of problem when I had a vacuum leak due to running a line through the fire wall to an intake vacuum gauge. Check all your vacuum lines.

[snafu352]

Is this something i can do myself, it soo how do i do it. Or should i take it somewhere, and where what kind of shop should i take it???

[OldmanPurdy]

Checking vacuum hoses? Yes you can do that just open the hood and start looking for any cracked ones.

[nissanman04]

sounds like a fuel problem to me. try changing the fuel filter, injectors may be clogged as well.

[silvia2slow]

not to steal this thread or anything, my car does the same exact thing. my car jerks so hard sometimes that the back wheels squeal like i am spinning my tires. if it was a clogged injector, wouldn't it do it all the time??? the same with the fuel pump???

[devnull]

I had a similar problem with a Ford Explorer. It would randomly lose power, but recover after a few seconds. It turned out that one of the O2 sensors had a fracture and was responding slower than the other ones.

[MTX450]

yeah, i have the same problems...ive had the car for over a year and haven't been able to locate the problem...although in the same month i had 2 injectors die....so possibly the other 2 are clogged or mising or something...who knows...i also get about 21 mpg too....both highway and city driving combined...

[S0lid_Snake]

my 1994 winter beater safari does this, but it shakes violently, i cant let the idle drop below 1000rpm, but as soon as i shut it off, or if i let it die, it fires back up fine... its probably the 12+ year old wiring