Check for timing belt slapping inside of cover. Should have been changed at 60,000 miles. The cover has an inspection hole. Remove plastic plug to inspect.
SOURCE: 2000 nissan sentra
You prpbably need a new ECM/computer. Nissan had a problem with the ECM box and the foam inside the box. The glue, which Nissan used to attach the foam onto the box EATS up your computer internaly. The vapors from the glue it self damage the ECM/computer. Nissan actually has a campaign to remove the foams out of the ECM box. By the way ECM has 80000 mile warantee, so if your car has less than that, Nissan will replace it for free. I see it all the time. Sentra with heater circuit code
needs an ECM 95% of the time.
SOURCE: My 1993 Nissan Sentra GXE
Have you checked your MAF? Sentra's are famous for them having problems, I havent had an issue with mine yet thank god.
SOURCE: 2002 NISSAN SENTRA GXE 1.8 POOR IDLE LACKS POWER IDLE FLUCTUATES BETWEEN 1800 TO 1100 RPM
Check for vaccume leaks and also you PCV valve. check the hose too. Visually inspect every vaccume hose you can find. Sounds like a leak .
SOURCE: 1997 Nissan Altima with idle jump
The description sounds like a technical Service Bulletin Nissan came out with on your car. It fits your description to a "T".
However, the codes you are getting are not what the service bulletin reports. The code they say it sets is DTC 0400 which relates to an irregular EGR operation, causing a problem where it will not maintain an idle or Will idle roughly. There is not a recall campaign on this item.
As far as misfire problems: Nissan had a service bulletin out on problem ECM's which caused this problem. Check with your local dealer. This may possibly be covered under warranty.
The reference number is NTB97-026 The bulletin was issued March,12,1997 There was no recall on this item.
Good luck to both of you.
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