Question about 1990 Ford F150
Check your vacuum pressure and see if it is normal.
If you have a vacuum advance the pressure would matter. If you have a throttle position sensor TPS, its suppose to regulate spark and fuel simultaneously. Advancing the timing will lean the fuel charge, some of the last adjustables had a wire above the top front of the timing chain cover. You would disconnect it, set base timing and reconnect.
Posted on May 15, 2010
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Posted on Jan 02, 2017
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