100K MP5 Club

Our P5 is only at about 220. Funny, I looked back and saw that in Jan of 2008 I was at 175k miles. Very limited miles lately. It's been my daughters the last two years. Just taking her to and from school. I've got all the stuff for the timing belt. I was going to change it late spring, but I've been busy at work. The timing belt might be a bit overdue. (wow)
 
Been browsing the forums for a couple months. Finally decided to register. 138,900 on a stock '03 auto. Bought the car with 32k and change on the odometer in 2005.
 
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This is where I'm getting it, so who knows how high it'll get.
 
I'm in the 170,000+ miles range. Pretty good car and I've replaced some major items in the last two years.

It was a low-mileage car for its age until two years when I got a new job with a mega long commute. I do an oil change every two months when before, I was doing an oil change every 11 months.
 
I just hit 100k miles in my 03 protege5 2 nights ago. I could hear angels cry lol.
 
I've got 2 sets of plugs, the JDM spec plug and the USDM spec plug for it, both sets are almost brand new. I haven't replaced the coils yet though. You think that could be it?
 
Typically with bad coils you feel the misfires, however, I wouldn't rule that out. At 176k, it could be a slew of issues. The cat(s) could be getting plugged up and/or O2 sensors going bad. Have you done a top-engine clean? It could be carbon build up affecting the upper rpms.
 
I've seafomed it and that's about as far as I've gone with cleaning. I've only got 1 cat on the car right now and that's the primary cat on the manifold. I'm leaning towards the carbon build up and/or coils because it starts the flat spotting around 3,750 and does it all the way up as far as I know (I grab a gear at like 5,500 at most).
 
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