My truck seems to surge and buck. I got the code and it says I have a small emission leak. So I put a new gas cap on it but it continues to do this only intermittently.I can't figure out what this is? Has anyone else had this problem! My truck is a 2002 f150 4x4 with a 5.4 liter. It hasn't tripped the check engine light but when I asked my dealer he told me that sometimes it wont trip the CEL. First Time here any help much appreciated!

 

What was the code? First you said, you got the code and it said it was a small emissions leak...
po456?

But at the end you said it hasnt tripped the CEL