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in a pinch I'll use NGK's, with the understanding that they oughtta be pulled and replaced with the bosch supers in short order. Beru's work well too but, are tough to find.
On the head subject, I've seen 2 117 motors with weird idle problems that are isolated to 1 or 2 cly's that were not the result of burnt vavles but, the guides walking around in the heads, both were in the 150K to 200K area. Try doing a idle drop test and see if you have one or 2 cly's that drop somewhat less, this combined with a comp test and a leakdown test should give you some insite into the mechanical health of the engine.
Cam's, look for scaring at the top of the lobe, it'll look like its been wiped with antisieze. also look for raised edges on either side of the lobe past where the rocker rides.
Got a smoke machine handy? They are wonderful for getting to the bottem of intake leaks. Other items include the rubber boot under the a/f sensor, mismatched flow rates from the fuel head, dist. shaft/bushing wear (rare) and vacum leaks from inside the car or the resivior. (ok, so I cant spell)
Joe
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Project Smoker, '87 603 powered wagon
Hauler, 96 CTD can you say torque?
Toy 73 Cougar xr7 convertible
Acme Automotive Inc.
Raleigh NC
919-881-0364
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