Why engine cuts off

Well, I'm sorry to say, but the vehicles presence is necessary for testing. With situations like this, a technician really needs live data from the vehicle as the problem is reproduced. If you don't trust your mechanic, we have several in your area that are certified and trusted. They can give you a proper diagnosis, and an honest estimate for repair. I'll paste the link below. http://repairpal.com/nissan-within-10-miles-of-norcross-georgia-30093

The 3.3L engine distributors are multi component configuration and proper testing can be very difficult or even impossible! .. From personal experience I will agree with the mechanic on this one as the distributors are very problematic and replacement is the best route to take here .. The remans are junk at best .. A quality new part will ensure reliable vehicle operation .. What I have witnessed on these vehicles with the 3.3L is the engine starts and runs great when it is COLD .. The warmer it gets the worse it runs! .. One can raise the hood and observe engine operation from COLD start through the warm up process and can actually see the engine start running rough.. IF you have these symptoms then the distributor 'assembly' is suspect... NAPA seems to have the most reliable replacement distributor I have found... Avoid the discount parts stores for this part! . From just the symptoms you've posted here, one must assume your vehicle does indeed have the V/6 instead of the 4 cyl... Good luck with the repair!

Kiss. Keep it simple s. The vehicle tries to die when brake is applied. This could be indicative of a vacuum leak also. Take wd40, start fluid, or propane torch cylinder, propane is the safest and best choice. Go along intake man gasket, head gasket, all vacuum hoses etc the propane cyl on low and not ignited, or lit. When you pass over an area that has the vacuum leak, it will suck propane and engine will smooth out. You may have to have someone put foot on brake to re enact the stopping, while vehicle is in drive. Set e brake, choc wheels and don't put yourself in apinch point where vehicle can run you over or crush you. Stand on side reaching into the engine compartment, not in front where you can be run over. This is a trick used by experienced mechanics when in an environment that is not controlled(like a shop). Be careful, and good luck.