97 PSD, need advice
Newbie here, I have tried to research my questions but have not seen what I'm looking for so don't shoot me for asking again. I have recently bought a 97 F350 PSD 2wd dually. It is basically stock, it does have a Superchips micro tuner and a K&N filter. I don't know alot about diesels so thats why I am here! I have a couple problems I am hoping you can help me diagnose, first off the temp never gets about the O on the word Normal on the temp gauge, is that normal? The second thing is that it does a weird slow power up when you start it, it only lasts for a second or two but you can definately hear the motor speed up. It also after being driven, and being as warm as it gets, when you let off the gas the engine rpms drop to near nothing when slowing to corner or turn into a parking lot etc. And lastly it does have the rough idle, that runs fine when on the road. Sometimes when you fire it up it seems to missing on a couple cylinders, very hard vibration that will usually stop when warmed up. I have had to unplug the EBV, even though it was clear as was the tube, and I did replace the cam sensor in it yesterday. That did seem to help with the low idle somewhat but did not solve it, nor the rough idle like I had hoped. I did try unplugging the ICP ( injector sensor) on the engine yesterday after driving it and it did not change the idle at all. And finally my last question for the moment, the HPOP oil, how often should it be changed and what kind of oil do you put in it?
I have not changed the fuel filter on the truck yet, I hope to do that tomorrow, I did hit the drain valve on it just a minute ago and it did not seem to have any water in it. This could be causing some of the rough idle problems, just wanted to see what you guys thought about the other issues as well. Any input it greatly appreciated.