im being told diff thing im lost help

[powerstroke94.5]

Here we go it seams like I don't have the right power
I have a 94.5 dually it has 350000 mil on it I have replace glow plugs injector o rings when I'm sitting at an idle and I rev it up to 1000 rpm it feels like it has a dead spot almost like a miss people tell me it could be vavles or camshaft have a flat spot or a bad injector and it has just been running like **** sometimes I'm just concerned on the way it has that feeling when I'm at 1000 rpm

[JSchuricht]

Glow plugs are just for heating it so you can start in cold weather. Get a scanner, check for codes, run a contribution and buzz test, check ICP and fuel pressure. Also make sure your fluids and filters are good.

[powerstroke94.5]

All the fluids r food and the filters and the fuel pressure is good to what is a buzz test .
And for the scaner is it an OBD1 or a OBD 2 for these trucks o heard it has both

[JSchuricht]

It's a OBDII plug but not fully compliant. The 94's had both and might need a computer upgrade to activate the OBDII. Something like a Autoenginuity with the Ford bundle will read the codes. A buzz test will trigger each injector so you can hear if they are firing.

[powerstroke94.5]

How do I do the upgrade for OBD 2 and where do I go....how do I do the buzz test
Thanks for the help in new to diesels and I'm learning new **** everyday

[JSchuricht]

I don't know much about the OBD1 trucks. From what I have heard they have both connectors, one under the hood and the other under the dash. It takes either a computer swap or reprogram to activate OBD2 if it wasn't already done.

[Patrick Feeley]

If it were mine with that many miles, I would pull the valve covers and run it, looking at the oil out the injector spouts for uniformity between them. While I was in there I would probably check for loose injector poppet screws and measure the armature clearance (shouldn't be less than 0.002"). Cheers!