94 f150 351. Has a slight stumble when started like one cylinder misses. Despite this, it idles fine. On some occasions at cold start, it will stumble then run at very low rpm before kicking up to normal idle a few seconds later.
If i floor it, it has a slight miss and then immediately picks up.
The past few days its hard to restart after its fully warmed up. Tonight after warming it up it wouldnt start. I checked codes and nothing. Ignition coil had stong spark and pulsed with test light. Injectors had voltage. Fuel pressure has been at 30 idle and 35-45 reving and remained at this when it wouldnt start.(jegs fuel rail gauge)
Not exactly sure of what the problem was at this point, i opened the air filter box and blocked the intake tube before the MAF sensor and it fired up. At this point im guessing its leaning out after the engine warms up. Any ideas?

 

What do you mean you got "nothing" when you checked for codes?

You should have at least gotten a "111" (System Pass), if you didn't get a damn thing then you likely have a bad computer.