Every great once in awhile if I stand on the truck pretty hard or just a heavy acceleration, I notice my FP drops at cruise from 16.5psi to about 14.5-15psi. It is the strangest thing because if I turn my truck off and restart it, the FP is back up to normal and doesn't give me any more problems for a couple weeks. Has anyone experienced this before or know what is causing it? Very strange...

I have that, thought it was my fan, but after shutting off the fan still did it.