I have a 2012 Kia Rio with about 200k miles.
My car has been chugging going uphill and accelerating slowly.
I ran a compression test.
190 170 182 189 Dry
193 200 188 190 Wet
How worried should I be about that 170 psi?
Also, I noticed after I cleaned the plugs and put them back in the car ran great for about 100 miles then started chugging again. The cylinder with the lower compression had a dirtier (black) spark plug than the rest of them.
Thanks in advance.
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