since it used to do it every 3 months or so).My idle has been fine until 2 days ago when I noticed it to "start dropping RPMS" during stops. What will happen is the car will kind of shake one good shake coming from the engine. Sounds almost like the very first second of the engine when it rough idles. It will do that for a split second, then it's fine. Then about 2-3 seconds later, it will do it again.
I checked the ECU codes, first time it came out w/ 32 & 45, which was the problem I was having right after the hot shot header installation (about 1 month ago). To fix that problem, I reset the ecu, set the idle a little higher, and it worked fine for a month.
I checked the connections, maf, egr (not really sure how to check these connections, just made sure the valve was still intact, hoses in the back (not sure about these either, they seem to be good - no cracks, all in place).
Reset the ECU, put the idle back to where it should be (all the way down), drove around a bit, and codes are gone. However, the "sputtering/dropping/idling" problem is still there. I believe I'm idling somewhere between 600-750 or so.
It is not one of those life or death idle problems - like I had before where'd it would stall in the middle of a stoplight. It's just a little "spurt" of idle drops. The rpms don't fly all over the place, they hardly move at all. It's just the shaking coming from the engine, very weird.
My car: 89 240sx automatic.
Any help will be greatly appreciated.