This problem has been going on for a couple months but is getting much worse the last week. Intermittantly my truck will not accelerate much when I push the go pedal,it will slowly build boost and pick up speed but it is worse than an old 6.5 gm boatanchor. Then it will take off when the rpm's get up around 1900-2100. I checked the codes and it is p0236 which is turbo superboost or something like that. Fuel pressure is good just changed the filter last week.Any ideas on what is going on?

thanks

 

Bad map sensor, I had one that was intermittant. Check volts and resistance here's diag,

 

Thanks I will have to check that out. I appreciate the diagram.