Rough idle 1996 Chev.PU 350 Vortec
Truck has 250k miles, I put the last 100k on it ,changed oil every 3000 mi and it has always ran fine.After I retired it set for 2 months ,before I started using it again.Since then it has had a rough lopping idle. Starts right up and drives out fine ,but rough idle.No codes on readers. Any ideas please.
try running the fuel through the truck and put fresh gas in. Also check for vacuum leaks. Rubber hoses tend to get brittle and crack over time.
This was since I retired a year ago. Changed plugs ,fuel filter, thought about sticky valves or lifter ,put seafoam additive in gas and oil seemed to help a little.
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