I have an 98 auto-altima how do yo u increase power off the line. becasue its slow up to 21-2200 rpms, i got new fluids, new alternator, new transmission, but it is lacking need some suggestions to increase overall power

for off the line performance you need to beef up your low end. there are many ways to do this, but i can only suggest a few. get a lightened or an underdrive pulley, intake, headers, exaust with a non-restrictive cat and muffler. these are good places to start.

A high flow cat, and muffler is a great way to start, add a header and a cold air intake and you should see some very decent inprovements.
More air in, means more power......, but you need to effecenitly get the exhaust flow out as well.
I did the high flow muffler and converter on my jeep and it made a diffevernice of .9 seconds in my 0-60 times. When I added a kn gen II intake it went down another .3
Also some sort of computer chip would help, maybe a venom module.
They are supose to give you an increase of up to 25%, but will modify the way your transmission shifts which will help alot.
Also try bringing your rev's up before you launch it, it helps a bit. Some where around 1600rpm should still be low enough that you wont hurt anything