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unscrew the distrupittar cap and turn it till it's right, make sure you use a timing light, if you don't know what that is then please, do everyone a favor and have a professional do it. Actually, since you asked how to in the first place, have a professional do it and save yourself the potential the get hit with 80,000 volts, or getting you fingers chopped off from the fan.

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Q: How do you adjust timing on a 1988 GMC 350?
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