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Loss of power and fuel economy. Plus slightly higher Turbo psi.
I have a 2004 with 200k miles on it and recently I have noticed a sudden decrease in fuel economy and acceleration is poor at times. I replaced injectors at 196k and my FICM is normal voltage (46-48v). I really don't know what coul be causing this. I took it in for a service and they saw the EGR valve was bad so they cleaned it and we unplugged it an i started running stanadyne formula in my fuel and I began getting 23mpg highway. Well that lasted about 2 weeks and then my mpgs slowly began decreasing and my turbo psi was increasing. Just last night I filled up and calculated my mileage and I got 15.1 mpg. Well that's too low and I need to do something. At first when all this was happening I took it to a transmission shop and they said they heard something internal and sounded serious. I later heard this shop gets sued quite often so I took it to 2 other shops and they said everything was normal. And that's what made me think it was engine related but I don't know what it could be.
My symptoms are a very loud idle, loss of fuel economy, and higher turbo boost with a sputtering sound. Also no exhaust smell in the cab which is good.
Anyone know what could be causing this?