b2300 1997 rough idle and stops

[ktm-boutin]

Hi I just changed the engine of my b2300 1997 and since that, the engine idles rough when starting the truck, it goes up and down (between 2000-2500 approx.) then it idles fine but will die after about 2 minutes of idle. I tested my IAC and TPS with a multimeter and they seem to be in good condition, but when I unplug the IAC the truck runs better, no rough idle.

I changed the fuel filter and the spark plug cables.

Any idea of what it could be?

Thanks

 

[Earl43P]

Clean the IAC and its ports.

The shaft and the piston that slides on the shaft.
Whack it against your palm, repeatedly, making a thwock sound.
I use Seafoam.