Codes P1340, P0300B, P0131

2000 Passport 3.2 Liter. Engine is sputtering when idling. Will stall if idling over a minute. CEL blinks when pushing throttle. Do these codes mean I need new plugs? Thats kind of what I gathered from reading through the pages. Right wrong or way off. I originally thought it was the EGR, then IMG, nothing pointed to that when reading the codes.

Aftersearching the P0131 code some more, could this be caused by a bad IMG? I'm clueless here. Does anyone have an opinion please??

Passenger side IMG cracked in 2 places. Replaced both and running good for now.

Do they put in an upgraded version of the IMG, or do you just expect another failure in the same amount of time?

I just bought the standard gaskets. Don't think you can buy anything else. Or I don't know about it if you can. What I did do (thank you AF) was had them make sure they only torqued the bolts to 13 ft/lbs instead of 17 (what the book called for). I'm hoping this will help.

Thanks. Hope it works out for you!