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How many miles are on the car? What kind of engine? What transmission? There are multiple reasons why a car can lose speed going up hill and then slow pick up in stop and go, start with the basics, air filter clean? Spark plugs good? new fuel filter? Oil change? tires pumped up to proper pressure? Transmission good? Post more and I will try to help
there may be a mechanical problem in the trans mission with that mileage it may be that it needs overhauled try a transmission specialist not the dealer
Just about all you can do is, with the engine off, from under the hood open the throttle all the way and check if the TV cable is tight. And check the fluid level, smell if its burnt or look if its brown.
Other causes could be,
Sticky governor
Sticking shift valve
Worn bands
Many years ago my mom's first 4 speed automatic was a 84 S10 2.8 2wd. She did not know it was a 4 speed and the indicator was broke so she counted the clicks to find drive. She was driving in the hills in over drive and all the downshifting was too much for it (should have driven in hills in 3rd gear). After that the transmission would not shift out of second gear.
Try changing the fuel filter. If it clogs up the engine won't get the fuel it needs to run at wide throttle openings, the engine will ****** the timing, and you'll lose power. With less throttle the filter can flow well enough for the engine to run properly.
have you changed the fuel filter lately a plugged fuel filter will cause this concern
did the power loss start all of a sudden or did you start losing power over time ?
That's often the sign of a clogged fuel filter. Running on level ground or not trying to accelerate hard, enough fuel can get through for the engine to make the power you need. But when you try to punch it to accelerate quickly, or you try to go up a hill (basically anytime max power is needed), the car can't flow enough fuel to the engine to make that power, and the car seems to fall on its face. Change your fuel filter out and see if that helps.
Is it a standard or automatic transmission? If standard, your clutch may be slipping. While driving down a straight road, push the brake while still in gear and push the gas pedal as well. If the engine slows with the vehicle, the clutch isn't slipping. If the engine speeds up while the vehicle is slowing down, the clutch is slipping.
If it is an automatic, check the transmission fluid. You may be low and the transmission is slipping while under load, or the torque converter is slipping for the same reason. You may have a bad torque converter clutch switch, but the computer should have picked that up and made your "Check Engine" light come on.
These are the main reasons you would be losing power going up hills unless your engine isn't powerful enough to handle the larger tires on extreme hills. (It takes more power to turn a larger wheel going up hill since the vehile has to travel further for each revolution of a larger tire. Incidentally, have your speedometer checked. You will be going faster than what the speedo says since you put larger tires on.) Good Luck.
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