i have an '86 and lately the Idle has been dropping lower than normal, im not sure what the problem is. I changed the Spark plug cables this passed weekend, im almost possitive they are all on correctly, but the idle is below one, where as its supposed to be over 1. Any ideas on what to look for or tinker with

 

what is the idle dropping to? when? automatic or manual transmission? what gear is it in at that idle?

 

when i put it in neutral (its a manual) the RPMs normalls were about 1,100, now they they go to about 900-1000 for about a min or so then drop down to somewhere in the range of 500-700

 

stock RPM is supposed to be about 650 for manual transmission Z31s. There should be a sticker on the underside of your hood showing stock timing and idle speed.

 

Ok thank you, ill be sure to check that

*walks outside to car*

you are correct, says 650-700RPM @ Idle, thanks =)

*Sorry for the stupidity on my part, I just turned 17 and this is my first Project car. So much work to do on it (95% is interior..so im hopeing)

 

crap, i knew there was somethin wrong, im idling at around 1000-1200 with my manual transmission, ill have to get that fixed. Im also having trouble with the car sputtering early in the morning on a cold engine, im sure thats normal but is there a way to fix that???