Posted this on another site but didn't get a response.

Ok so here's the deal. Over the last year and a half or so I have been having problems with my 2006 F150. Originally it sounded like a diesel sometimes when the rmps would drop. It would carry on like that for 10 -15 seconds then it would clear itself up and sound fine. After several weeks it would start acting up at higher rpm's as well. Did some research on here and determined it was most likely the cam phasers so I replaced them along with the timing chain, tensioners and guides. Seemed to be better at higher rpm's but would still make the diesel sound when the revs would drop. I disconnected the VCT solenoids and this seemed to fix that problem but it had a miss under load and less power since the timing was i guess stuck in whatever position and I drove it for a couple months cause I didn't have a chance to mess with it. I replaced the solenoids a while later and that seemed to be the ticket. Ran real good and was a lot quieter. Until this weekend. I drove it out of town for a tractor show and was hauling a little 6x12 trialer with a*garden*tractor*on it. The whole rig couldn't have been much more than 1500 lbs. Did real good for most of the way of the 190 mile trip out except for the last 20 miles or so. Seemed to just not have as much power. I was bucking a pretty strong head wind and hauling the trailer so didn't think much of it. The was home was a different story. Ran normal for the first 50 miles or so then started to seem real weak then the engine went in to limp mode and the CEL started blinking. Looked down and the oil pressure on the idiot gauge had dropped to nothing. Limped it about a mile to the next exit and shut it down in a parking lot. Let it set for a bit and restarted it but made the same diesel sound, oil pressure lookd like it cam back but after about 30 seconds at idle it fell off again. Called my uncle to bring a trailer and it sat for about an hour and a half. When I started it to put it on the trailer the gauge said it had oil pressure for the 3-4 minutes it was running during loading but still sounded rough. It now sits at my uncle's nearly 3 hours away and I'm trying to decided the best way to approach it.

I know that all the timing is hydraulic controlled and it sounded very similar to how it sounded when the cam phasers were acting up and it was constantly missing making the diesel sound. I understand its optimistic but would a clogged oil pick up or bad oil pump cause this by not providing the oil pressure to the solenoids and such on the top end?

Update. I had my uncle start it. I wanted to see how it ran when cold. Initial start up made some noise, most likely from no oil on the top end but only lasted a couple seconds. Ran smooth and sounded normal for a few but just about the time the temp gauge started to move it made that diesel rattle and he shut it down.

Any ideas?