Checked out most things I know to check other then the fuel pressure. Still no luck. Definitely not the EGR, comp. check came back with all 8 around 150psi, can't seem to locate any real vacuum leaks, although there may be a slight leak around the throttle shaft where it goes through the side of the unit/ TBI base gasket replaced, no fix there. I have good spark, new rotor and cap, new fuel filter. replaced wires a few months ago, but I did slightly burn one due to broken looms, replaced with an old wire, still the same problem. Plugs look good. Problem seems to be getting worse, so I am leaning towards the fuel pump going out. Still not 100% certain. It really struggles to climb a steep hill from a stop. It's almost not driveable now. Problem does seem for some reason to be more driveable in this cold winter weather until the truck gets good and warmed up. Where do I get one of these tools to take the place of the fuel filter? I might just break loose the fittings in the line where it transitions to a 20" stainless flex line from the frame rail up to the back of the engine block, and see if I can just make up a 3/8" tee with the male and female fittings I need. We're supposed to get some arctic weather starting this weekend, so I hope to figure this fuel pressure thing out asap or else it may have to wait! Any other ideas? Is there a specific procedure I needed to follow to make sure I didn't have a burnt valve? I just cranked them all over 4 times, and checked the gauge, watched if for 20-30 seconds to see if it bled down, and went on to the next. Would a burnt valve not build that kind of pressure to begin with? Thanks.