Just got back from a 1000 mile trip, and this morning i started up the car and went to work fine. Now when I went for lunch, the car gave me a rough start. I had to crank it for around 4 seconds to get it to catch, and the begining of the crank seemed really weak. What all should I check?

Battery is 6 months old, it has 67k miles and i had the full 60k mile service done. Oil was changed right before the trip.

what could it be?

 

Check fuel pressure and see if it bleeds down.

 

where do I buy the guage to check fuel pressure, and how do I do it?

(I may not though, since it seems to be fine now. The starts take a little bit longer than before, but still under 2 seconds)