Hey guys, need some help with my LLY.

'04 LLY, s&b intake, level, rims and tires, no chip, no codes that I know of, no SEL, everything else is stock. Just replaced a hub, not really any other work done to it.

Took the truck to a local shop to have the trans flushed, coolant flushed, and decided while it was there to have the fuel filter replaced. Got the truck back and it's surging (idle up), sometimes at idle but mostly when driving around. Has hard starts and sometime will die a couple minutes after starting it, when it does die, I have to prime the fuel.

From the research I've done I think it's due to either the fuel lines being corroded or when the shop replaced the fuel filter, they messed something up. So I decided to wait a couple of days to see if it would develop a fuel leak but it hasn't. The truck has no leaks actually. Is there a way to test the fuel lines, or should I just replaced them and go from there? Thanks!


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