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(1990 Ford F-150)
in Ventura, CA on October 13, 2010
po411 Check engine lite does not come on but when system is checked po411 pd shows up. Problem is when coming to a fast stop, engine seems to keep rpm up and with brakes applied engine stalls. Also when starting still in drive, sometimes it lags until 1000rpm or more then starts moving.
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on October 13, 2010
I think you mean the code is 411, which means the self test could not control the RPM during self test - low RPM check.

Without too much information available without being at the truck, I would say you likely have an idle air control valve issue or a throttle body that is dirty. I believe the computer is saying that it is hard to control low speed idle.

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