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E450 Shuttle Bus w/ 7.3 ticking noise..
Recently I noticed a somewhat loud ticking noise at idle. It increases with speed w/ engine RPM. At first it was only on the driver's side but now it seems to have jumped to both.
Bus seems to be way down on power.. it's a pain to get up to speed on the highway now.
Engine has 150k miles, no noticeable smoke or anything like that.
Anybody have thoughts on where to start?