No power after timing chain replacement. Ignition?

[madneren]

Car is a 2004 Maima SE VQ35DE.
I changed the chains and tensioners, car runs but stutters and has no power. I drove it around and top speed was about 60, with hesitation and backfires. Drove it to autozone to get codes pulled, and P0300 and P1136 came out. I drove it around After the codes were pulled and it won't go above 20mph now, and usually just dies.

I'm wondering could I have mixed up the coil packs? There were no labels on the wires so I kind of just did an educated guess as to what fit best and where...

If anyone has a wiring diagram for the colors of the pack wires that would help a lot, as far as the 1,3 and 5th cylinders. Besides the common red/black power and ground wires the 1 cyl is yellow/red, 3 is green/red, and 5 is purple/white

[MinisterofDOOM]

Welcome to NICO! Since you replaced the timing chain, I'm wondering if it's a cam position sensor problem? That usually throws its own code, though.

P0300 is a generic misfire code (so that may support your wrong-coil diagnosis). P1136 is for a variable intake timing error, though.

Here's a link to the FSM section including ignition coil wiring (you can use "ctrl+f" to search for text to make searching easier). My cursory glance didn't find any color-code labelling, but there are lots of diagrams in there. Have a look and see if there's anything that helps confirm your arrangement. USUALLY the wires to each cylinder are EXACTLY as long as they need to be to work, so it should be tough to mix them up without knowing. But it's been a while since I've messed with coils or plugs on a VQ35, so that may not be the case here.

[madneren]

Sorry for the late reply, been busy at work.

Ok so after I posted this I messed with the coils and got them into the correct order, 2 of them were mixed up.

After I did that however the engine started smoking from the valve covers. I'm talking visible smoke seeping thru the valve cover gaskets and out of the oil filler cap if I take it off.

Today I just tore the engine apart again and redid the timing as per the manual on http://www.nicoclub.com/FSM/Maxima/2004/

#1 cyl at TDC, cams both in their correct positions with the small hole/dowel pins facing up and out.

Buttoned it all up, ran a lot better but still a little low on power and still smoking out from the valve covers.

I really have no idea wtf to do anymore

[maxhopper]

If you ran the engine with the incorrect timing, you may have bent/damaged some of the valves. You'll either need to get a look at the valves with a borescope or remove the heads to inspect for damage.