I asked the previous owner and looks like he changed the intake for a short while, changed it to an OEM piece of a 350z, just below the elbow pipe. Also found out while had the car the check engine light came up for him and he needed a new MAF sensor, which was done in 2008-09. My car has 67,000 miles so its under the 70,000. The RPMS def. revs over 2500 when I press the gas pedal.

 

to be completly honest with you....

you need to take it to a shop. We can all say this or that, but we cant diagnose over the computer.

if my usual checks dont work, I have my dad take a look. If he cant find anything i take it to the shop.

No sense in spending $150 on a part that may not fix it.

 

Sounds like the trans is shot. Sounds like the 1st owner didnt do the regular maintenance.

I have a set of rules I follow that has let all my cars last over the 100k mark wit no problems.

Change trans oil once a year
Coolent flush once a year
Rear axel oil change once a year
Fuel system flush once a year
Full Syn oil change every 5k miles
Belt change once a year
PCV valve change once a year

If I buy a used car this what I have done with in the first month of owner ship plus a couple of other things.

 

I'd say accept the hit, take it to a reputable shop (not a stealership) and get it OVERHAULED. I can't believe a tranny would go out this soon...

EDIT: wait... if you're under warranty... tell them fix EVERYTHING

 

Mine went out at 70k or so.

 

You don't know what you're talking about, plain and simple. This is one of the best auto trannies out there. Numerous reviews and an overwhelming amount of evidence back this up. You may think it's a POS, but it's just your opinion, and not based on anything other than that, making it practically worthless.

It's not just the 70K mark, it also has to be less than 6 years since your "in service" date, which means the date the car was first sold to a customer. Considering it's a 2003, it had to have been sold after April of 2004 to still be under warranty. It's extremely unlikely that's the case. I hate to say it, but it's probably the transmission, and the sooner you take care of it, the less it will cost you. You could talk to Infiniti about getting it covered under warranty since it does have less than 70K on it. This isn't unheard of, but it's pretty rare. All they can say is no.

 

+1, over 100k and no problems with my a/t

 

I still wouldn't rule out the MAF ior even possibly a vacuum leak in the intake tract or the plenum. A simple vacuum test would reveal a vacuum leak. Seeing that this car had an intake, there is a chance there's a leak in the intake track, just after the MAF. I'd remove the entire intake assembly, disassemble, reassemble, and reinstall. That's the safest way and only takes about 10 minutes.

OR if could be the transmission. We'd know a LOT more if we knew what code had/was getting thrown.

 

+!. Let me/us know if you need a step-by-step on how/what to do!

 

Doug, replace the MAF sensor. Trust me.