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Rough Idle, Hunting Idle 200 1990

posted by  Stormie on  Mon Jan 26 09:18 CST 2009
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last visit: Mon Nov 4 14:12 CST 2013
[RELATED]

sons 240 wagon. No vacuum leaks, plugs / rotor OK, New Exhaust system with new O2sensor, replaced fuel pressure regulator, cleaned throttle body, checked AMM - all OK. Tightened intake manifold, cleaned flame trap, new air filter, no holes in hose from airbox to throttle body. I am stumped...

Starts fine, idles smooth for ~30-45 seconds, then idle surges from 900 - 1500rpm, almost stalling. Any ideas?

Thank you






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