Loosing power Corolla 2004

Question

This is about my 2004 Corolla automatic with 225,000km. Recently fuel economy has gone down and car seems struggle to reach 100km/h. I checked the MAF sensor and it is dirty. I cleaned in with MAF sensor cleaner and wonder if it should be replaced. Auto parts stores shows different pricing and some about A$350!
Also I pull out one spark plug and its picture can be seen below..

https://ibb.co/KzK5Gk8h
https://ibb.co/xt3LDNCy
https://ibb.co/8DXKhZCZ

I feel its time to replace all 4 plugs. Does the brand matters? Owners manual recommend Denso/NGK.
The other question is about the "air intake hose" This seems never changed and now it is less of rubbery like..I initially thought maybe a crack init may be the culprit but can not see clear crack but surface of the hose seems peeling.

Please share your thoughts...

Chuck Tobias · Accepted Answer

[quote data-userid="180191068" data-postid="326116"] Recently fuel economy has gone down and car seems struggle to reach 100km/h. [/quote] Lots of things can cause those kind of symptoms from clogged filters to low fuel pressure to sensor problems to clogged catalyst to internal engine problems, and more. You really should do a full diagnostic scan for codes and data. [quote data-userid="180191068" data-postid="326116"] I checked the MAF sensor and it is dirty. I cleaned in with MAF sensor cleaner and wonder if it should be replaced. [/quote] If your MAF sensor needs to be replaced it would show up in the data. Be sure to use an OEM part from a trustworthy source if replacement is necessary. [quote data-userid="180191068" data-postid="326116"] I feel its time to replace all 4 plugs. Does the brand matters? [/quote] Of course the brand matters. Use the plugs recommended by Toyota, once again from a trustworthy source. There are a lot of counterfeit parts out there. [quote data-userid="180191068" data-postid="326116"] The other question is about the "air intake hose" [/quote] It would be no surprise for a rubber part to deteriorate in a couple of decades. Check it for leaks.