If you want to check the injectors, take it to the shop and have them do it.
However i would not do that because I'm not sure thats the problem. You can take off the serpentine belt and spin each pulley to see if any bad bearings might be the issue, but read on.
It sounds more like IMRC gaskets. Have you been losing water (antifreeze) but now sure where it's gone (no drops on driveway). If you're not sure, wait for the problem to make the engine stall (hopefully when engine is colder to risk injury), then pull the number 3 spark plug out. It the plug is wet (with antifreeze), then your gonna need intake manifold gaskets. (upper, lower, and frontside valve cover)
If that's the issue, to buy the gaskets and do it yourself it's pretty cheap, but it will cost a bit for labor.
windstar intake gasket kit - Google Product Search
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1998 Ford Windstar GL 3.8L 253,100 miles
2005 Toyota Prius Package 6 1.5L 135,000 miles
2006 Toyota Sienna LE 3.3L 36,000 miles
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