I say find a different mechanic that knows his trade as that one doesn't
As for your statement it maybe possible but not probable as the engine is designed to rev out without engine / valve train problems
High rpm with worn valve train/hydraulic lifters may cause a lifter lock and cause the problem as it allows the lifters to pump up and cause the valve springs to become a block and that will mean that the rockers can no longer move so that will bend the push rods
accelerating to pass a car and it happened would indicate a problem in the transmission actuator as the transmission will down shift initially ( passing gear where the engine rpm increases by 2,000 rpm but then the manifold vacuum takes over and shifts the ratios in the transmission which brings the rpm down as the road speed builds up
SOURCE: noise while turning when accelerating
Probably a, or both front CV (constantly variable) joints in the front half-shafts (the driveshafts that run from your transmission to both your front wheels) are going bad. Not a too uncommon problem. They run about 150-160$ Canadian dollars a piece for remanufactured front shafts (from NAPA Auto Parts). Not too sure about labour cost, could be a few hundred dollars.
SOURCE: Car shakes
The load placed on the transmission when you accelerate is what is causing the shake, it is not tire shake/out of balance, even a badly worn U Joint will seldom cause this issue, I believe the dealer is correct, let him tear down the transmission, if he doesn't fix it then he just gave you a trans overhaul for free, ask for the exact cause of the failure once the dealer has the transmission apart, the rule is make the dealer responsible for his diagnosis of the problem, I know how this goes, I worked in new car dealers for 30 years.
SOURCE: Loss of Power at Freeway Speeds
Sounds like itr is not getting enough fuel. Try or check the fuel filter for dirt or water, and also check the fuel pump pressure to see if it meet factory specs.
Good Luck Jerry
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SOURCE: 1998 Nissan Pathfinder will not accelerate
It's your MAP, MAF OR TPS sensor Do you have a check engine light?
SOURCE: Rough idle, Car shakes, sputters and misfires upon acceleration
It sounds like you may have a problem feeding the fuel to your engine, I had the same problem with my 89 RS. All the 1989 model's fuel systems were recalled. I think you may need a new fuel pump. The fuel pump is located inside the gas tank in the rear of the car right under the rear axle. The fuel pump itself isn't too expensive, but with other small parts such as the electrical harness upgrade and fuel filter and the labor you should be looking somewhere in the $500 range. I hope this helps.
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