Car Jerks and doesn't accelerate
 

Hello

I have a 07 G35S sedan auto transmission with 76k miles on it. Recently I am experiencing that the RPM goes pretty high when I slow down and during curves and try to accelerate. Car doesn't get the power though. Its like I am accelerating while I am in neutral

Today, when I was driving to work, I noticed vdc off and slip light came on immediately I started moving and the max speed I can go is 30 mph. If I try to go above that, car jerks as if I am driving a manual incorrectly( like I am in first gear , with not working on clutch) . So it jerks and car slows down. I have to keep it under 35 mph or under 3000 rpm to keep going.

Searching on web gave me various results, with people saying it could be the valve, ECU etc. Did anyone experience this? i will take it to local mechanic here since I dont have a Infiniti dealer within 130 miles from my place. Any help would be greatly appreciated.

PS: I should have posted this in Sedan's section

found this on this forum

5) One day I was driving and couldnt go above 20 MPH VDC and slip on.... needed new throttle body.

so looks like I will need a new throttle body. Anyone kno how much would it cost

do you have a service engine light on if you do pull the codes cause at this point it could be anything.

No , service engine light did not come

You have 2 throttle bodies if it's an 07.

This pretty well describes "limp mode". I can't believe you don't have some kind of ECU fault code available, even if it's a stored code. Get your codes read and report back. Situations requiring the ECU to invoke limp mode can be quite serious, but that's not to say they can't be minor as well. Best to get to the bottom of it quickly.

took it to local auto shop and they couldn't find anything. and car doesn't do it anymore.

how do i get ECU codes , do i have to go to dealer. sorry for dumb question

The ECU diagnostic codes are read through the OBD-II port. Did the shop you took it to hook up a code reader to see if anything was there? (Any competent auto shop should have looked for them already.) If they didn't, depending on where you're located, you can usually find a way to get the codes read for free by an auto parts store or many auto repair chains, additionally you can buy an inexpensive reader and DIY (i.e. you DON'T have to go to the dealer). Just be sure to look for all stored codes and write them down before erasing them!

water maybe?
 

As you know this is the coupe section so I'm not sure if my similar 6MT conditions apply, but this happened to me when I got some water in the intake cleaning the engine....I seriously thought my engine was about to seize it was bucking so bad, but apparently it dried up. It started right up 20 minutes later and the ECU cleared all the CEL's. That was back in May and Ive been fine since then.