My 2000 honda crv loses power coming up a hill, almost dies when going slowly around a corner. For a few seconds coming up a steep hill and losing power, the check engine light came on for about 3 secs.

Suggest you focus on recreating the problem. If it's an automatic try power braking in reverse. Hold the brake on with left foot so the car doesn't move and slowly press on the accelerator. This will torque engine and drivetrain to maximum and may reproduce the problem at will.

You got a bad connection to the fuel pump inside the tank.

No
not if you drive it accordingly
steep hills are best negotiated in low fears with plenty of rpm applied
for example on a steep grade with a manual 1st or 2nd or possibly 3rd and the rpm around 2000 constant will cause it no harm
automatics will go to first automatically so keep the rpm at that mark
engine damage is experienced when the gear selected is too high and the engine is placed under extreme load so down shift to allow the engine to work easily
When going down hill select first and only use the brakes to maintain the 2000 rpm range and allow the engine compression to hold the car speed back
the rule of thumb for experienced drivers is this
you select the same gear to go down that it took to come up

check your 02 sensors,also sometimes that could be from clogged cat.converters,usually from bad gas, i had the same problem,but lucky for me, i went up a steep hill,i forced it and i heard a loud pop,black smoke,then i got my power back,but ive been told that could be dangerous as you can destroy ur engine from back flow,good luck

tranmission is sliping or low on fluid.is there a lot of miles on truck.engine not lossing power transmission is sliping.

Start with the fuel filter. Thats the most common thing. If no difference come back.

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

check egr or your mafs ok

I had a similiar problem on my 1999 Dodge Ram 1500 Conversion Van. It ended up being a partial collapse of the catalytic converter which didn't allow adequate exhaust. The problem only showed itself because I could not get over 55 mph going up a small hill.

the power problem sounds like a bad alternator or else there is a loose belt as far as shifting out of park its probabally in the transmission