95 Nissan Maxima GXE 5 Speed 130K miles
My car recently have this weak start when i try to start it up it would start up at a very low RPM then raise back up really slow and sometime the RPM would just bounce up and down like someone was on the gas or something it mostly happen when the car is been driven for awhile and is fully warm up everything seem to be fine when the car is sitting around during the night and i start it up in the morning i have recently replace alot of parts on the car already below is a list of that parts that i recently change for my car THANKS for any help that is provided !!!!!!!!!!!!!!!!

1# New Factory Start
2# Knock Sensor
3# NGK Spark plugs 6 months old
4# crank sensor
5# Fuel Filter
6# Cleaned TB

 

it maybe...

1. Vacuum leakage
2. Leaking ERG Valve
3. Air filter clogged
4. fuel pump not delivering sufficient fuel to the fuel injection
system
5. Leaking head gasket
6. timing chain and/or sprockets worn
7. camshaft lodes worn
8. or may be that your idle speed is incorrect

hope your max gets well soon,

 

Could be the fuel injectors or any of the things infamous wrote...

 

Check the adjustment of the cold idle linkage. There's a plunger down under the throttle body that opens the throttle plate up slightly when your car is cold. It acts sort of like a choke by bumping up your idle speed when you start the car. There are small scroll marks on the linkage that will guide you in setting up the cold idle circuit. These scroll marks should be lined up with each other after the car sits overnight.

The Haynes Shop Manual explains the system pretty good.

You may also need to clean your IACV. (Idle Air Control Valve)