[DrCoolbeans]

So, I gave in and brought it back into the garage. Guy did the smoke test again, but again came back negative. He mentioned this time that they don't have the proper equipment to test the gas cap. I would have figured he would have told me that he hadn't checked the cap in the first place. So, bought a new cap myself and lo and behold, (knock on wood) 100 miles later, and I haven't gotten a light. Fingers crossed.