You don't have to go top the stealer, many independent garages can help.
Anyways the 3.4 motor is common for intake manifold leaks. My guess the check engine light will help reveal that. One way to check the intake gasket for leaks is to spray carb cleaner or similiar around the gasket and listen for an idle change. I have heard of using an unlit propane torch to do the same. The thought makes me a little nervous though.
Don't procrastinate on this, if the gasket rupture in other ways, serious damage to the motor can results. I have seen these suck oil or coolant into the combustion chamber and the low fluids create expensive problems.
One more thought- Use whatever octane the truck calls for. The PCM expects it. Check owner's manual if not sure.
Thursday, October 11th, 2018 AT 7:32 PM