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Surging is almost always caused by a lean condition. Now, whether or not the lean condition is a result of a problem or a programming glitch is another story. A vacuum leak, poor fuel pressure or flow, bad ECT, etc. can contribute to the cause.
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ASE Certified Master Automotive Technician w/L1.
ASE Certified Master Medium/Heavy Truck Technician.
Certified EVT (Emergency Vehicle Technician)
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