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Idle speed increases/decreases in PARK and DRIVE idle 200 1992

My 92 240 has developed an idle problem whereby it goes from 900-1500- 900, while in park and in drive idle. When it gets 10-20 miles the engine begins to cut out upon acceleration. I can pull over and it will go to the erratic idle again. I've checked fuel pressure and is fine. Both pumps are <5 years and I recently changed the fuel filter. Is this the IAC or some other FI/Ign problem?

Thanks!
--
92 244 lowered, Bilsteins, IPD sways, Unitek cam/header, TSW Revo 18x8's - 94 965 , 96 964. - 76 Datsun 280Z lowered, modified head, cam, headers, intake






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