SOURCE: Rough idle after new plugs and fluctuating RPM's
Check that you have installed correct type of spark plugs and wires are well fitted. SPARK PLUG 3.5 V6 Type Champion RC10PYP4 Plug gap 1.0-1.1 mm (0.039-0.043 in.)
SOURCE: idle too high +goes higher when put in gear (manual transmision
IAC valve problem. Nissan has a updated harness (with one way diode inside of the harness) to prevent backfeeding for the IAC valve and a new IAC valve also gets installed. That's where I would look. IAC valve or "idle air control" valve.
SOURCE: not stable idle but no loss of power when RPM over 1500 SES light ON steady
change o2 sensor. reset computer by removing terminals and hold them together for 45 seconds themconect them ground first. them restart car.
SOURCE: idle up and down to 1500 rpm at first start when cold
Have you by any chance taken a multimeter & tested your TP (throttle position) sensor ? If you think you might know how, let me know & we'll guide you through it. If not, at least take wiring plug off & clean both plug & TP sensor contacts with contact cleaner, and inspect for any corrosion while doing it. When putting plug back on, use a little di-electric grease in the connection. Have you sprayed your throttle body & throttle plate good with throttle body cleaner recently?
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