Quote:
Originally Posted by old cool
almost forgot. be careful when starting. old gas and tank could become an issue.
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This is very important. Crud in tank will mess up a constant flow of fuel. Pull the tank and have it cleaned out and sealed. Your engine appears to be original. GMC engines were painted red from factory. GMC engine codes are not the same as Chevy. Very little is known about GMC engine codes, info is just not out there.