what could cause rough idle?

[canaris]

I know I asked this question before...but I had to start a new thread cause I know a lot of people are expierencing this problem.


On my 95 3.8..so far I changed crank sensor..egr valve.wires...plugs...and the problem still persist...


Where else should I be looking at.....?


The car once warmed up the idle gets from bad to worst..and sometimes it chonks out...(dies)....


Any input would be greatly appreciated....thanks!

[nicke66]

Originally Posted by canaris

I know I asked this question before...but I had to start a new thread cause I know a lot of people are expierencing this problem.


On my 95 3.8..so far I changed crank sensor..egr valve.wires...plugs...and the problem still persist...


Where else should I be looking at.....?


The car once warmed up the idle gets from bad to worst..and sometimes it chonks out...(dies)....


Any input would be greatly appreciated....thanks!

Could it be as simple as a intake vacuum leakage? The IAC valve tries to control the air but if there already is to much air the valve can´t make this in a controlled manner. The valve turns from closed to fully open in a few seconds and the idle RPM goes up and down.

Vacuum leakage does not generate error codes.