Idling issues when cold

[sr20bobby]

whats up guys, my daily is a 2000 nissan sentra 1.8 and out of the blue, when i start it when it is totally cold, it will start and idle on 1500 rpm for about 20-30 seconds and then will bog down and really rough idle then have to start up again and rev until engine =s warm, and then its fine. But the car feels like it is lacking power too under acceleration. Also if i start the car and rev it high right away until its hot its fine but still lacks power under acceleration. engine light it on and codes read low fuel pressure, blocked injector(s), large vacuum leak, MAF sensor fault. I don't just want to buy parts and see if they'll fix the problem, rather have an idea of what i need so any of you ever have this problem or something similar? thanks for your time!

[IIC53]

Hi,
Hopefully you found a fix by now...
I purchased a G20 for my son a year ago with only 78k miles , it has the same 4 cylinder engine...
After about a month of ownership, it had the same symptoms as you, and getting worse and the ECL was coming on, in addition it was hesitating randomly.
The error code pointed to the primary O2 sensor.. Not knowing history of the car, I did a full tuneup: spark plugs, ignition wires, rotor, distributor cap, O2 sensor, new air filter, thermostat and cleaned the MAF. This did help some, however did not fix the real problem.

Next pass I replaced the MAF and the gas filter. After that the car run absolutely great until about a moth ago. The symptoms are coming back. I will start with the gas filter first and see if that helps. I will update this once I isolate/fix the problem.