2000 Chevy 3500 misfire

[ken_man_1]

2000 Chevy 3500
454 (7.4) Vortec
Auto trans

Replaced intake gasket - involved taking distributor out and taking apart the plenum. Replaced gaskets, reinstalled everything exactly as it was taken out, now we have cylinders 2, 4, 6, and 8 firing very rich. 1, 3, 5, 7 are all nice and tan (plugs), so I'm hoping that someone can shed some light on this for me. All harness connectors are plugged in, and everything is snugged up correct. I'm going to pull the plenum again just to make sure there isn't something plugging it up. I did check the distributor to make sure it was on right as well. We put the #1 cylinder in compression stroke to TDC, and lined up the cap to the #1 plug contact int he cap. I'm pretty sure it's ok.

Any help is much appreciated.