The one that I use now is from a '90 Dakota. Maybe it's just plain worn out. It's a pain in the butt to change mine. I don't want to do all of that work for the same result.

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Are your headers near starter? Your installation might be heat soaking your starter. A sheet metal heat shield might help your situation.

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Yes they are. The one tube comes within a little less than a 1/4" of the starter. You may be on to something. I had thought that around 1/4" would be enough clearance.