A contaminated MAF sensor can cause this problem, and is fairly common on these. They can be expensive, so try the other suggestions first, but if all else fails...
-Robert Apprentice Automotive Technician
I have a 94 Ranger that I bought used with 110K miles on it.
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> V-6 4L Engine
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> Automatic
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> A/C
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> It runs great except for excessive pinging or "rattling" on mild to heavy
> acceleration.
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> Engine temperature seems to make no difference.
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> I have tried medium grade fuel which does not seem to help.
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> Any thought on where to start looking for problem.
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