Trouble with air flow

[sillybanshee]

i just bought my 240sx and the air box had been altered. when i rev the engine. it didnt want to fully stay @ one rpm even if i didnt move the gas pedal.i think it might of been the cold but i let the car warm up for 5 - 10mins. after that i just slowly rev'd. to 5000 rpm. the car seemed to struggle and maintain the rpm for 10secs.... at times would even dive down 2000 rpm...i was wondering if i should go buy o finda stock air box and setup from a dealer or go to a junk yard and do the same...or just go with an aem cold air intake...any advice would really help. thanks

[nismojunkie]

how has the air box been alterd? try checking your MAF and maybe see if your TB is sticking.also search and see what you can come up with.

[180fan]

5k and 2k? if the rpm is that high, did you check for kinks or anything like that in the throttle cable?

[sillybanshee]

no....but the previous owner cut out the lower front side ( end pointing towards the front of the car) out so that it sucks more air in...i dont kno bout anything else.but i was just warming up my car and pulling it out....and it would continuly die on me...not shutting off but really dieing....so i rev'd it and it wouldnt want to live....

[rogoman]

Why don't you first do a general tune-up.

[sillybanshee]

ok.. for that do i go to the normal nissan dealer?

[180fan]

you can search for "tune up" and see what's involved with that. it's fairly easy to do and will be much cheaper to do on your own versus having a dealer mechanic do the work for you.