Codes, codes, codes

[Okiefromwatonga]

Ok, so I got my Auto Enginuity yesterday, and did some motoring of the truck with it both hot yesterday and cold this morning. hot or cold shes kicking the same codes.
P1316 IDM Codes Detected, then when I do a buzz test I get P1271 Cyl #1 High to Low side open, P1272 Cyl #2 High to Low side open and P1274 Cyl #4 High to Low side open. these need to be replaced I am assuming since the UVC's and VC Gaskets are less than 4 years old.

Any input on them? Also, are these 3 the IDM codes the DTC's re talking about?

[jc82chevyman]

Well you still might check the plugs on your uvch to make sure there not lose also are you getting any symptoms or just codes

[Okiefromwatonga]

Shes impossible to start in the morning if you dont plug in the block heater, regardless of temperature, and has a mildly rough/stumbling idle till shes completely warmed up, has a SES light on till you hammer down and get it boosted then the SES light goes out and the engine smooths out.

[jc82chevyman]

Def check those plugs