2006 Nissan Murano Questions

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Bought used last month with 75,000 miles. It started out getting about 15 mpg and has gradually decreased over the past month. I mostly drive only to/from work 5 miles round trip. Use regular unleaded gas.
I can replicate the noise if I hold the brake and rev up the motor to 1400 rpms.
in good condition; routine service
Leaking slowly on wheel well and driveway. Any ideas?
The lights for the A/C, defrost, etc don't light up anymore and I was wondering if anyone knew which fuse these might be linked to so I don't have to check them all.

My 2006 Nissan murano sl gives a strong jerk everytime I starts it up in the morning, It's like the engine is going to fall out. But once it cranks up it doesn't do it again until the car sits for a long period of time. Is it my camshaft position sensor or crankshaft position sensor?
The bottom of the driver seat is loose.
no check engine light on; cranks fine;
To access cylinders 1 and 3 is difficult. Do I need a lift?
low fuel kight comes on guage drops below empty. most of the time service engine soon light comes on.
This happens often, but not all the time. The motor mount was fixed, cv-axle was replaced and have a new set of tires. Still the vibration is there but not as much prior to the above repairs. Had it checked for leaking, but my "shade tree mechanic" could not locate the leak. Took on out-of-town trip. It handled great except for occassional vibration. It almost feels like something is slipping and vibrating at the same time.
What is the problem
On a cold start there is a griding sound until the engine warms up. My nissan dealer told me it would cost $3400.00
The Part number is CAF1792. I want to do this myself instead of paying some one to do it. It has not been done since the 60,000 mileage mark.
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