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Old 01-16-2009, 10:46 AM
Randy Randy is offline
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Join Date: Apr 2005
Location: Northern Louisiana
Posts: 481
When I bought my '86 420 from the original owner, it had the same problem; replaced the idle control box underneath the front passenger toeboard, and problem solved; perfect sweet idle for 5 years now.
At this age, there are lots of possibilities like air (vacuum) leaks, but this is what worked for me.
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