The engine may develop a misfire due to worn valve seats. This fault will cause the Check Engine Light to illuminate. Our technicians tell us the misfire may or may not be felt while driving. They further recommend that both cylinder heads be removed and thoroughly inspected and repaired as necessary.
Engine Misfire Due to Worn Valve Seat on Chevrolet Express 2500
Average mileage: 160,000 (160,000–160,000)
Engines affected: 5.0L V8, 5.7L V8
9 people reported this problem
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Cylinder misfire, not the plugs or wires! 140,000 miles..... sounds like my problem.
We have replaced fuel pump almost as much as tires. Now the van has a gasoline vapor smell Inside vehicle, and Ed just had tune up, and furl filter, pump, replaced, and it runs worse than before it broke down. Help