wont start

hey all

After a long week working on swapping GT40Ps and an explorer intake on my car, i tried starting it up tonight.

The build is: GT40Ps, cobra 1.7 RRs, trick flow springs, trick flow timing chain set at OEM cam timing, explorer intake, 70mm TB and a C&L 73mm MAM. Stock bottom. Swap done with engine in car.

It has fuel. Ive gone down the cranks but no start checklist from jrichker and have a few ideas, but im still at a loss.

Its throwing codes 21, 23, and 24.

Please help!

heres more info.

i think its exploding gas in the exhaust. i had the midpipe slightly off the header collector at first and was very alarmed to see flames shooting out of the gap. i realigned the exhaust but it still wont start.

i thought i might have had the dizzy 180 out so i flipped that around and it still sounds like its exploding gas in the exhaust.

i havent checked that i have spark but im assuming i do because im exploding gas in the exhaust. Im also assuming i have fuel because my garage stinks of it while trying to start it up.

so...

6.) Spark & fuel pressure OK.
A.) Failed IAB or improperly set base idle (no airflow to start engine). Press the throttle ¼ way down and try to start the car. See the "Surging Idle Checklist for help with all your idle/stall problems.
B.) Failed computer (not very likely)
C.) Engine ignition or cam timing off: only likely if the engine has been worked on recently).
D.) Firing order off: HO & 351 use a different firing order from the non HO engines.
HO & 351W 1-3-7-2-6-5-4-8
Non HO 1-5-4-2-6-3-7-8
E.) No start when hot - Press the throttle to the floor & try starting it if you get this far. If it starts, replace the ECT.
F. ) Engine that has had the heads off or valves adjusted. Do a compression test to make sure the valves are not adjusted too tight. You should have a minimum of 90 PSI on a cold engine.

A Compression check sounds interesting but i havent figured out how to get all of the plugs out since im not running P specific headers.

I was super careful with my cam timing. Im pretty sure its OEM or damn close.

I think its ignition timing but im confused because flipping it 180 made no difference. I would think that one way would start right up and another way wouldnt start at all. Both ways seem to be exploding gas in the exhaust.