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P0452 code set. on 1999 Chevrolet 1500 Pickup

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MIL on code PO452 set. Clear with scan tool and it resets immediately. Evap sensor replaced with fuel pump, no better. What needs to be done next.
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clearing code never fixes it. you need a diag from a shop that knows what to look for. you need a scanner tool, vaccuum pump, meter and voltage source to properly test to find defective part

Roy