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I've had my Versa since November last year. It's a 2008 Hatch with the 1.8. Since I got it I have installed a CAI, cat-back exhaust (currently 2.5" from the cat back to a flow master 10 with resonated tip), had the transmission replaced under warranty, and changed spark plugs. I have never gotten better than 25mpg with my average being 22-23mpg. Idling in drive at red lights it feels like the engine is stumbling, smooth for a few seconds, then rough (vibrations felt through car and pedal/steering wheel) repeating every 15-20 seconds or so. This is my first fuel injected car so I am not as knowledge's about the tech as I am with my other car (1984 El Camino with a carbureted 350). Would the stuttering idle be fuel pressure related? With the mods I've done (I've done similar mods on the Camino resulting in better mpg), intake, exhaust, I should be getting better fuel economy, right? The fact that the current epa estimates for a 2008 Versa Hatch are 27 city and 33 highway mean I should be getting about 30 as 90% of my driving is highway. What should I look at to fix this? Fuel pressure regulator? Any and all help is appreciated.
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