Opinions on engine codes

01SSslayer

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Mar 11, 2017
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So i just bought the truck, it had sat for a while. We believe the gas went bad. While i was test driving it the CEL came on, original owner replaced bank 2 sensor 1, CEL went away. He drove it around and it was fine for a few days. It also has new plugs. I got the truck Tuesday and drove it to work, on the way home CEL came back, cylinder 3 missfire p0303. Cleared the code to see if it would go away on its own. Drove to work next day, code came back on my way home, now its readying p0171 and p1131. So now heres my question, bad gas can mess alot of shit up, so after doing research it looks like it can be a few things, Vac line under the intake, bad o2 bank 1 sensor 1, injector going out, coil going out or dirty MAF. I am considering running a can of Seafoam through it just to see if it will clean everything out. What are your guys opinions?
 

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