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Another Bucking/Surging problem
So, it seems every time I haul calves to market my truck acts up. Then again that is when I use it the most. Last two times hauling a cattle trailer full of calves the truck wants to surge like it was running on 7 and then the 8th cylinder kicks in. Sometimes it just bounces around up and down a couple hundred rpm. I see the ICP fluctuate but I would think that normal since the rpms are changing. Twice now it bucked so bad it felt like I hit a wall and it took right back off. Three times after pulling for a while and having to stop at a light or stop sign it just shut off. Started right back up though. About 3-4 months ago it bucked badly and threw a P2285 (ICP). It never threw that code again since. I have reloaded the tune (Towing tune), cleaned the EGR, and did the blue spring mod. I have a new ICP sensor but have hesitated doing that since mine is an 04 with a late 03 motor and the ICP is in the back. ICP pressure seems to run around 1500 at 60-65 and 1800-2000 at 70-75.
Other things I have noticed. FCIM voltage usually around 48.5. I did see it drop to 47 a couple times but not during the spaz attacks that I noticed.
70,000 on the truck as it is mostly used to pull a cattle trailer. Lately is seems to idle more rough when first started than it used to. Since months ago when it threw the ICP code is has not thrown another code.
I guess change the ICP since I have it. Any other suggestions? Thanks