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Senior Member
Join Date: Jun 2000
Location: N. Phoenix AZ USA
Posts: 28,977
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Todd,
Had the same thing on my 85 and it was the idle stabilizer. Silver thing just forward of the fan, connected to two black hoses and below the fuel injection system on top of the motor. Rpm's had hunted at idle until I switched this puppy out then its been smooth as can since.
Cost $100-125 or so when I replaced mine. You might want to swap one out from another car to test, then if the problem stops, buy a new unit. Takes less than 10 minutes to change out. Two hose clamps, two 10mm nuts and one wire harness...
Joe
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2021 Subaru Legacy, 2002 Dodge Ram 2500 Cummins (the workhorse), 1992 Jaguar XJ S-3 V-12 VDP (one of only 100 examples made), 1969 Jaguar XJ (been in the family since new), 1985 911 Targa backdated to 1973 RS specs with a 3.6 shoehorned in the back, 1959 Austin Healey Sprite (former SCCA H-Prod), 1995 BMW R1100RSL, 1971 & '72 BMW R75/5 "Toaster," Ural Tourist w/sidecar, 1949 Aeronca Sedan / QB
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