Recently seafoamed engine to remove carbo. i do this annually. When accelerating to freeway spped, engine light illuminated. Codes: random misfire, cylinder 3 misfire, cylinder 6 misfire. Inspected plugs, they were clean. Change all plugs and cleared codes. Drove truck and engine light did not come on, but poor throttle respose and no power. Prior to restarting engine after plug change, cleaned throttle body and air valve (upon inspection they were clean,but cleaned them anyway). ANy ideas what could be wrong?

 

Blown plenum?
read the sticky at the top of the 2nd gen ram section.
how many miles on it? im in the middle of doing my plenum because of the same syptoms you describe.

 

Clogged cat from blown plenum.

 

^^^ x2 ahhh, the joys of owning a Dodge. I wouldn't have it any other way.

 

147000 miles. How to tell if plenum is blown?

 

Check the stickied plenum thread. Will learn more than you really wanted to know there.

 

Thanks for the replies. That catalytic converter is plugged. Inlet is hotter than outlet temperature. Engine vacuum increases when rpm is increased. No evidence of bad plenum gasket. Apparently Chyrsler had a recall for my truck catalytic converter. I am outside the warranty unfortunately

 

For recalls, it doesn't matter.... its a safety issue. If there was a recall, the should replace it, regardless of mileage.