91 240sx idles funny

[beefcakext]

after i drive it around for a like 10 min the rpms start to fluctuate. Example if you were holding the rpms steady around 2grand without you doing anything they would die down to almost a thousand then go back up again.when i drive the engine is quiet no abnormal sounds just the purring of the exhaust. Umm the girl that i bought it from said that for her it would run for about a half an hour then die and the battery had to be jumped. Ive had it for 3 days now and it hasnt died on me once. I did charge the battery one time since i got it. umm thats all i can think of if u need more tell me

[s13sr20chris]

check for vac leaks and also try running the car with the maf and o2 sensors unplugged.