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have a 06 350.just put new head gaskets on arp studs. truck will start when cold only. replaced all o rings on fule rail including dummy plugs. getting code 2285. have just pulled turbo off . would loose con. on irp cause this.iforgot to plug it back in when i did head gaskets. got it pluged in but not sure if it was tight
 

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yes, loose connection at IPR can cause this. PCM need to command IPR for 600 psi min, oil pressure to start truck. Did you replace the STC ftting ont he HPOP when you did studs??
 
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