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I have a 2003 Chevy 3500 mini school bus. It has a 5.7 L engine with the Check engine light on. It runs, but seems to miss every now and again, especially when going up hill. The check engine light flashes sometimes and sometimes it goes off.

Summary: We took it to the Auto Repair Shop and they scanned the codes for us. It had no current codes which made sense because the check engine light wasn’t on, but in the History codes there was Code P0300 Misfire Detected. The shop put the bus under load and code see multiple misfires on the scan tool and suggested a complete tune up. It has not had one and has 94,000 miles on it.

Fix:  The shop Replaced my spark plugs, Plug wires, distributor cap and rotor. I’ve been driving it for weeks now and haven’t had a problem since.

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