Well since I bought my 2001 Mazda B3000 3.0L I have noticed that when I start the truck it shakes and the idle bounces. Not really bad, maybe up and down 200rpms but it is there and annoying. Also it only does this while cold. I have cleaned the IAC, put a custom CAI with a K&N on, cleaned Tb, and seafoamed it. My truck only has 35,000miles on it so it should not need a tune up.
Also if yall could tell me what these 3.0L's idle at? Mine is 1200 at cold and 900-1000 warm. Thanks!

 

that sounds about normal... my iac was bad and when i cranked up it would rev to 3k rpms!!!!

 

wow!!
so what about the rough idle, does this sound about normal too?

 

now that i've got a new iac it idles fine... it has always idled up and down a little right around 1k rpms

 

Clean the MAF sensor, and reinstall the OEM intake, filter box, and OEM paper filter.

This will fix your rough idle problems......The ONLY thing you gained with the CAI and K&N is more noise, and more dirt into your engine.

 

Oh ya I forgot to say I have cleaned the MAF 3 times. And the reason I put the CAI and K&N in is because of this problem. This happened before when it was stock.
Also to make it more clear I still have the box I just put 3in. tubing from the box to the wheelwell and 3in tubing from the box to tb. Also snorkel is out.

 

Do you think the autoparts store would allow me to install a new IAC and return it later if it does not fix it?