2006 Kia Rio 5 sx Losing power on incline (not misfiring or stalling)

Asked by Jun 06, 2017 at 12:01 PM about the 2006 Kia Rio Rio5 SX

Question type: Maintenance & Repair

2 years ago I had this same issue. Ran diag and it threw misfire on 2 and
4, MAP/MAT code (the catalytic converter) and and O2 sensor code
I replaced the plugs/coils, it did not fix the problem. I replaced the
Cat/Manifold and it fixed the problem. At the time they replaced the
Cat/Man the mechanic showed me all the gross crap he had cleaned out of
my rear Cat and told me it would be ok for a while but would need to be
replaced as well. 2 years later to current day....I have yet to replace the
rear Cat. My actual question is would it be in my best interest to try to
replace the rear Cat or the front?  

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