ok so hers the situation I have an rb26dett powerd silvia recntly my idle has been acting up when the motors cold the idle would bounce around from around 900-1300 or so. The car would also randomly stall on me while im off the gas comeing to a stop or truning. When the car is doing this odd idle it runs CRAZY ritch and puffs nasty black smoke out the back of the car. About two days ago I hade a flat tire. I went to move the car into my garage when it fired up fine but when I started to back out it stalled I figured this was one of the normal stalls so I tryed to restart but couldint I figured my battery was weak as this is a common problem aswell. so I changed the tires on my driveway where it died. once I was done I hooked the car up to another and tried to start. but nothing happend the car was turning over but the motor isint fireing. I have plenty of voltage to fire the car so power isint the problem. any sugestions on what could be my problem I have a feeling these two problems are linked some how any help would be nice thanks.

 

how long has the motor been installed and how long was it running fine until this occured?

 

not sure y it turns off and wat not tis happened to my mates rb20det r31 it might
just possibly need a tune... but try pumping the accelerator when your turning it on....