Preface: the smog tests were done with the same gas, same ambient tempurature, and same warm up time. And within very few miles from each other.

The first guy failed me on egr and gas cap, but emissions passed with flying colors. So i replaced the gas cap with a good one from another one of my cars, and replaced a cracked hose to the egr valve.

2nd guy failed me on egr and blue smoke emissions (new to me, the first guy didn't mention it at all), but he didn't fail me on the gas cap, and emissions passed with flying colors.

I decided to get a tune up on my car just because it was due, but not cause I thought it would help smog, as I am sure I have and egr issue.

I then take it to the 3rd smog guy. He fails me on gas cap visual and gas cap function, egr, and emissions failed horrribly.

I told him I replaced the gas cap, but he said it had cracks. I know for sure the gas cap is good, but I buying a new one from the stealer-ship now. I just dont see how after a tune up, the cars emissions is worse (failing).