1991 240SX I have an idle problem, HELP!

[ajaffer]

All right, i used to have this problem very rarely but now its occuring more often and its a real pain, this is what happens, i would be driving normally and then for example i would come to a stop and I would put it in gear and while holding down the clutch as im rolling to a stop, about to downshift to slow down, the rpms drop under 1000 and then my car just shuts off, unless i raise the clutch like im downshifting and i save it from turning off. Or even if i put it in neutral while going to the stop and start braking it sometimes just drops under 1000 and turns off. The only way ive worked around this is by giving it some gas while the rpms are dropping, or for some reason tapping the brakes, keeps it on. The car drops under 1000 and almost turns off like from no gas being given most of the time, What is the problem??

[drjohn]

Could be a vacuum leak or it maybe running to rich and by hitting the throttle it gives it more air. Check the coolant temp sensor connection for corrosion, the green funk.If you have an exhaust leak before the o2 sensor this can cause this problem by drawing in unmetered air. Check for air leaks in the intake system also.