Idle Problem

[iam2pro4u]

When i first start my car up it will not idle. I have to keep giving it gas to keep it running untill it warms up a lil then the car will idle but it idles really rough and the rpm's will go from like 500 to 1000 back to 500. It never seems to stay at a standard pace. Also when i first start the car it makes a squeaking noise, ive read that it could be the timing belt. It only squeaks when car is started and is cold, once the car is warm and i shut it off and start it there is no squeaking. Any idea what is causing such rough idle? and am i correct about the squeaking?

[Canyoncarver]

First, check for ecu codes & vacuum leaks. Vacuum leaks are a very common cause of rough idle on our cars.

The squeaky belt(s) are most likely your accessory drive belts. If they are old, replace them and clean the pullies in the process. If they're relatively new, one, or all three of them, needs to be tightened.

If your "timing belt" is squeaking, you have a rather big problem.

[Milo (San Antonio)]

First, check for ecu codes & vacuum leaks. Vacuum leaks are a very common cause of rough idle on our cars.

The squeaky belt(s) are most likely your accessory drive belts. If they are old, replace them and clean the pullies in the process. If they're relatively new, one, or all three of them, needs to be tightened.

If your "timing belt" is squeaking, you have a rather big problem.

2nd. I would also consider cleaning your connectors on idle sensitive engine electronic parts (MAF, PTU, TPS and CAS) and also use some dia-electric grease on them as well for good measure. Also consider doing your normal maintenance like cleaning your throttle bodies of carbon buildup, change spark plugs, change out the fuel filter if needed, OHM test the fuel injectors, run a good fuel system clean like 44K (only available at Nissan dealerships) or Seafoam.

Sounds like you just need to do basic maintenance, honestly. Most of these are very simple after initially doing them.

[iam2pro4u]

Well ive done alotta the maintence. I changed oil, transmission fluid, new engine harness, new turbos, igntion harness, spark plugs, fuel system cleaning, cleaned out the throttle bottles, exc. Im thinking maybe its what you said about vacuum leaks cause my vacuum hoses are old and some dont seem to stay very snug. So ill try replacing that and for the squeaking ill replace the belts and hope its that and not timing belt.