engine shutdown mystery
97 maxima, 134,000 miles. (I have invested over $1600.00 in this problem so far, even many days in the hands of a reputable mechanic): When driving or even idling in park, once engine heats up (15 mins driving, 25 mins. parked) the engine will stop. It will restart immediately. No engine codes. I have replaced the computer, fuel pump, fuel filter, fuel press regulator, most of the engine sensors (even though no codes), even completely drained and refilled fuel tank. The car runs smooth and strong, then stops. I have noticed it occasionally struggle when decelerating trying to keep idle speed-(drops too low-I have to "catch it" with accelerator) When this shutdown occurs when parked there is no swing in idle speed-just an abrupt shutdown. After all of this both the mechanic and I are left scratching our heads. After all of this money, I am hesitant to put another dime into it. I have not replaced coil packs or plugs (another $130.00 plus shipping) even though mechanic indicated he doubted trouble here. Any direction here would be appreciated.