Hi, i was hoping that someone could help me, i had the valve cover gasket repalced, coils and spark plugs inspected and the machanic said they were fine but im still getting the same hesitation and stalling so i tryed pennzoil fuel injection cleaner and it didnt work, tryed pennzoil full system cleaner still didnt work and lastly pennzoil octane booster. what should i do? Thanks in advance.

Welcome to the forum!

This may sound crazy, but consider replacing the battery if it hasn't been changed in quite some time. The LS is pretty finicky about the battery being in very good condition. Even if a load tester shows that the battery is fine, it may still not be sufficient to keep the LS electrical system happy.

You can use the "Search this forum" feature from the LS forum main page to see if others have had similar issues solved by replacing the battery.

Otherwise, you're going to have to use a datalogger or scan tool with datastream mode to monitor some of the fuel and ignition system values in real time to determine if you have a fuel issue or ignition issue.

Oh, when's the last time the fuel filter was replaced? Also, have you checked the air filter and cleaned the Mass Air Flow (MAF) sensor?

-Rod

Thanks for welcoming me Rod, fuel filter has not been replace for awhile and the air filter i will change this week. If there is anything else please let me know as im new to this. Thanks