Problem wit my idle on my 90 240sx, anyone can help,i really greatfull

[S13_DriftKing]

i got a 90 240sx but has a 91 motor swap in it and the problems i got right now is that, when i drive n put it on neutral my idle start to drop really low n sometimes makes my car die or gonna die, and sometimes my idle keep going up n down, so if anyone knows wat the problems please tell me or wat can i do to it,thanks, Johnny.

[mickeystewz8]

i actually have this same problem. dont konw what the reason is but any help would also be appreciated by me

[austin9888]

i have a 89 and i swapped a 93 in it i noticed the same problem the only fix i have come around to is that there is a vacum hose the wil hook up to your intake hose over the rad if you kink it a bit (try clamping it with pliers for a second it will drop the idle to normal and be smooth no idea why

[Soravia]

1 -> Check the MAF connections.2 -> Check vaccum hoses3 -> Check PS fluid4 -> Check Distributor5 -> Check O2 sensor