Sup folks, first time posting but I've run into a pretty show stopping problem I can't figure out. My engine will not idle or run worth a snot.
The truck; 2001 Chevy S10 V6
The engine; 0 miles L31 5.7L V8 running stock fuel injection with a MPFI spider upgrade.
The PCM setup; Stock S10 411 running a 2002 Express 1500 engine and engine diag. segments with the rest of the PCM running stock S10 segments (Transmisson, etc), VATS disabled.
The Problem; My truck will not idle by itself, it bucks and shakes like its misfiring like mad. Its hard to start sometimes and will not rev past 3,000 without backfiring out of the exhaust.
Codes; p0200 code is the main cuplrit. I have a CASE sensor code because I've not performed the learn yet due to the engine not able to maintain smooth operation. I have an EVAP solenoid code but that is imaterial to the engine issue and a fuel level sender range code.
What I've done thus far (All parts are new);
1. Checked basics like spark plug wire order, connectors seated.
2. Checked for injector pulse on each injector in spider harness. (All are good)
3. Traced each injector ground to PCM and for continuity. (All checked good)
4. Checked for 12v on each injector. (All checked good)
5. Check Camshaft retard in my HP tuner (1.8 degrees, spec is 0-2 )
6. Checked fuel pressure on Key On. (55 psi)
7. Setup my HP tuner to watch for a misfire, PCM recorded zero misfires
8. Disabled fuel pump, poured about a cup of gas into the throttle body and started engine. It idled for a brief second or two but ran better.
9. Started engine, and made sure each pin in the spider connector was properly seating into the fuel spider.
EDIT:
Pulled all the plugs, very sooty/black except for #4 which was clean.
The engine still shakes the whole truck. When I first fired it up after flashing the PCM it ran WONDERFULLY; https://www.youtube.com/watch?v=JQbE...EE05DC83BD2295
I'm stumped, any help tracking this down would be very appreciated.