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Check your grounds too to make sure they are clean and now corosion ,,,a good ground is very important and is often over looked ...

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I had a buddy with a low 12 sec nova, ran great, all of sudden about 5000 rpms it would start to cut out.
he changed alternators, distributors, fuel pumps, battery, plugs, wires... he was about ready to give up when we discovered the grounds were solid and tight, but had built up corrosion between them and the chassis. we couldn't see it by looking at them, but just on a whim we pulled one and discovered this.
cleaned them all, and added a few more and problem was gone.