Q: my car engine doesnt stay on unless im pressing the gas

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my check engine light turned on a few days ago code P1518 manifold runner code. Last night a mechanic said the engine was dirty to put premium gasoline in drive for 40 miles change the spark plugs and oil change only had time to do the first part. This morning the truck wont start well it wants to if I pressed the gas it would run but as soon as I let go it would die but just the engine dies the radio and lights stay on.

My car has 222000 miles.
My car has an automatic transmission.

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