Hello,

I have been a G35 driver for almost 4 months now but have been having issues. My car was constantly stalling out or won’t start. So I got the spark plugs replaced, got the fuel pump replaced, throttle body, and got all the gas flushed out as well. Car is still slow to start and is not accelerating properly. Please Help!!!

 

Throwing any codes? That would be a good place to start. Pick up a cheap bluetooth OBDII reader off Amazon or Ebay, or get the codes scanned at local AutoZone. I'm new here and haven't experienced any issues like this yet but it seems crankshaft angle sensors are a common thing which causes stalling issues and is a pretty easy fix.

 

OBD2 scan for abnormal values and hidden codes. Clean the battery terminals, both ends of the wires and all the chassis grounds in the engine bay. This rules out all the "simple" problems.

 

The original codes it was throwing out were p1121 etc actuator, P0223 tp sensor, P0123 tps sensor, not sure on what those are exactly, I have a 2003 G35 coupe with 167K

 

I'm always amazed that someone like you will spend money on an almost fifteen year old vehicle and not spend a couple of hundred at an Infiniti dealer to run the VIN number, provide a service history and uncover any defects that could be used to lower the purchase price.

Too late now but check out the FSM

http://www.nicoclub.com/service-manu.../Coupe/2003/ec

See page EC-187 for code P0123
See page EC--283 for code P0223
See page EC-415 for code P1121

Good luck

Telcoman

 

Sounds like maybe your gas pedal is acting up. Those aren't exactly cheap fixes did you diagnose this yourself or have someone throw the parts cannon at it?