Check-Engine Code reads P0441 and P0450

441 is a evap code meaning it's not getting vacuum or the cannister is messed up 450 is evap as well but could mean the ecm is bador thhe valve is bad. If the canister isn't getting vacuum, fix it and clear the codes as that may cause both.

Would either error codes cause the engine to run rough (like a piston is not firing) than smooth out a few munites later (like all is fine with the engine)

if you have a vacuum leak yes that's why i said to check to see if the system is leaking vacuum like aline off. you will have to clear the codes after fixing the problem.

Where is the charcole canaster on the T-100?

by the gas tank

Along with the vacuum lines?

here is a pic of 3.4L engine. you didn't give engine size so others will be similar easy to look for.

Did. You ever figure this out I have the same problem?

Hello,

The user never got back to us on this so we will need to find out whats going on. Here is a guide that will help us start some easy testing.

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

and

https://www.2carpros.com/articles/engine-vibration-at-idle

Please let us know what you find.

Cheers, Ken

I have codes po441 and po450 has anyone else had these two codes and got it figured out? please advise.