P0200 injector problem after pulling intake

[harleyguy]

2004 buick rainier
5.3 285xxx miles

Wifes friend just bought this POS. She was told it needed a oil pressure sensor because it kept showing no psi sometimes. I couldn't get to it so I decided to pull the intake to get to it. Put it back together now it runs like crap. Code p0200 and p0300

I didn't replace intake gaskets because they were felpro and didn't look that old. And in good shape.

Killing cylinders none of the bank on the driver side make any change when I unplug the coils.
Please help. What did I screw up here guys?

[harleyguy]

Put a noid light on and confirmed no injector pulse on the left bank.
Anybody know where I can find wiring diagrams for this thing?

[Blue Bowtie]

I'm guessing that the engine harness/PCM connectors have already been inspected for damage, no?

[harleyguy]

Originally Posted by Blue Bowtie

I'm guessing that the engine harness/PCM connectors have already been inspected for damage, no?

I looked it over a little going to pull out the pcm and check plugs when I get off work.

[harleyguy]

Figured it out... well kind of. First off, online has nothing for these buicks. Found everything through envoy. Found wiring diagram for injectors. Had power at the fuse no power at injector started tracing wires. Un plugged the main harness by the fuse box. ( not sure if my wires ran through it) found my power wire right before it splits into 4 and goes to the injectors. Stripped it back had volts there. Checked again at injector had it there. Everything works. Put it all back together gave it a tail light warranty and hope to not see it again.