My 2001 toyota 4 runner when going up steep hills loses power and doesn't want to go no faster than 50mph, i've noticed it using more gas too? when idling i held the gas pedal to the floor and it sounds like its missing,i have changed the cats on it thinking that might b the problem but it wasn't the case,i'm am thinking it might b the coil pack or bad spark plugs?? if you could help me out that would b great

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Bogging - lack of power going up hills ' SHO Forum

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Oct 17, 2006 - I just ran into my first problem - The car runs fantastic on flats, going downhill,... ... No problem pulling up that hill at slow speed - plenty of power. It's only when out on a ... Anyone got a handle on a good used torque converter?

why do i lose power on hills - CarGurus

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CarGurusOct 17, 2013 - I lose power on hills change the fuel pump and checked timing changed catalytic ... The TPS will make the ECU "go nuts" as it says...I'm here. ... has no power going up hill with small boat on, on flat ground runs good 1 answer.

2000 toyota corolla lx aut. 4cyl. car looses power no power ...

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Check for trouble codes.

i would agree with them, i had the same thing go wrong in my gmc sierra replaced fuel pressure regulator and works great now, although you could get lucky and it be the fuel filter

going down steep hills will all but over ride a cruise control, since the motor is trying to keep the vehicle slowed to what your desired speed that you set , unfortunately this doesn't always work,, as your speed increases, the motor can't keep the speed reduced, when you apply the brakes, the system shuts off, cruise controls were meant to be used pretty much on long flat surfaces with Low inclines ,,

sounds like a clogged fuel filter. you need to have the engine pressure checked for leaks, you can rent the pressure checker at autozone, it connects to ur radiator and u pump pressure into the cooling system if u find water leaking around the head u know u have a blown head gasket. if ok then check the cylinder compression should beable to rent this also. it screws into the spark plug holes has a gauge on it. alternator problem w/ the light is probaly you need to tighten the belt.hope this helps!!!

Hi
It's most likely the EGR Valve, "Exhaust Gas Recycler Valve" when they start to go you lose loads of power especailly at 30-50 and on hill's

Is the engine light or any lights on the dash?
EGR Valves are about £130 you can fit them your self also.

Somedays it wil not do it at all other days you can barely drive the car.

Worth mentioning you may be able to clean it, so have a go before buying a new one. Use carb cleaner and spray it all over it, dont be shy, you cant damage it. dry it off and re-fit it that cures it then you should be ok, but be aware it may fail over the coming months.

Hope this helps, if not get back to me for more info.
It could be a few things but your description is so presise I would say it's The EGR.

Regards
Dan

did you check the mounts on the spare that is usually mounted underneath the 4Runner? also check for lose hangers on your exhust system

It depends: how steep are the hills? Assuming you have the standard 4-speed or 5-speed gearbox, it's likely that the tiny engine (built for economy, not for power) is simply not generating enough torque to pull the car up in high gear. Have you tried simply downshifting? If the problem truly is the engine losing power and not just lugging due to being in too high a gear on a steep grade, you should check your fuel pressure and you may also want to check the condition of the fuel pump and feeder lines inside the gas tank. A 20 year old car will probably have some disintegration of the feeder lines, they may even be partly broken off inside the tank resulting in poor fuel flow, or disintegrated rubber may be gumming up the strainer or the pump itself. Personally, I'd replace the fuel lines, fuel filter and if low pressure still exists, the fuel pump as well.

Sounds like you need a clutch replacement.

Try this. Go somplace where there are no cars, and no possibility of running into anything. Stop the car. Set the park brake. With the engine running, put the vehicle in 1st gear. Hold the foot brake pedal, and give it gas, and let out the clutch slowly.
If the engine does not stall real quick, the clutch disc is bad.

1992 4 runner 4 x 4, I think it is already passed 150,000 miles.the pistons and rings are lose and are leaking, the pressure probably low, try to use some oil treatment, I used Market America special oil treatment and got a very good result. you can set to 19 degrees and add some of those treatment see the result, this is cheapest way, just try it, because I can not test drive your car and check the engine pressure.
Please be sure go to MarketAmerica.com and check it first.