My 2001 3.5l just had it's check valve replaced. Now on start up it smokes a little bit then . When driving around town it doesn't smoke at all, but if I go on the highway around 60 miles an hour for about 30 miles , off ramp then accelerate again, I'll leave a smoke cloud.

It doesn't run rough at all.

Any idea's anyone?


Thanks for any help.

MK