I noticed car shaking around the first couple of gears in my 08 altima 2.5. Took it to dealer said replaced transmission as it was bad and under warranty. Day after car wouldnt start, towed to dealer said they ran diagnostics and found some misfire codes engines not covered anymore so charged me towing fee and "maybe" car needs spark plugs replaced. Replaces spark plugs and fixed problem for about a week but sure enough car started jerking again. I am very concerned as it actually had to try twice to get it to start today and it shakes violently when i accelerate almost like a hiccup type of shake not vibration.... im thinking it could be a fuel problem but im not sure what to do. if the dealer cant even diagnose the issue WTF do i do... any help or suggestions would be extremely appreciated!