Assistance with an N14 red top celect

We have a 95 Pete with an N14. 3 weeks ago the turbo blew. Put new one on, ran great. Next day after getting fuel it started running like crap, and the oil pressure dropped. It usually idles at 20, and nearly 45 when in use. Now its barely 10 & 25. Assumed we got a bad batch & treated the fuel, changed filters, etc. No change. Installed a new set of injectors, oilers, gaskets. Sounded great during test drive, then again like crap & still no oil pressure. This weekend we changed the oil pump & related gaskets & O rings, dropped the pan (did find small piece of the turbo). Started it up, perfect pressure....next day, back to square 1. Now what? I know rods & mains should be next on the list.....but it doesn't run badly all the time. Except for constant low pressure, sometimes it sounds great, then all of a sudden it starts banging and carrying on, (like maybe not getting enough fuel) you can feel it in the floor. It is our opinion that if a bearing had gone, it would run badly consistantly. Plus it's been driven about 1500 miles since the turbo in between trying new stuff. If it was rods and mains something should have given up completely by now.

 

Yes, #### & span. Put new O rings on the pick up tube & checked screens. Also changed the low pressure sensor today.

 

No, thought maybe some had gotten in when the turbo went, so checked that. Next day after oil change was when we change the oil pump, so it's had new oil twice.

 

Would it run consistantly bad if it was the cam or a worn lobe? Instead of up and down?

 

The main reason was because it ran so well right after the new turbo, thought it had gotten shut down quickly and no other damage had been done. But if it had damaged the rods and mains wouldn't it run ####ty all the time vs some of the time.