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Re: 1991 4x4 S-10 4.3 surging loping
What is the fuel pressure when acting up?
Have you checked fuel and air filter?
Any check engine lights or codes?
Any bad vacumn lines or vacumn leaks?
Good Ac delco plugs?
Base timing set right?
Has EGR valve been checked?
PCV valve good AC delco?
Have you checked the base gasket under TBI.?
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Remember proper testing gives us the answer to many problems.
MT
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