Help! SOHC->DOHC swap, idles weird, 3 codes

[mike2016]

Ok i just did the dohc swap and it wont idle good, but it pulls hard and drives good, but it will jerk when i on/off throttle. it won't rev past 6000rpm, it just stop and the intake makes a loud popping noise.

it's a 98 S14 KA running on 92 DOHC Harness + 92 DOHC ECU + 92 DOHC sensors + 92 DOHC distributor...etc

all the junk vacuume lines are removed down to only 1 vacuume line for fpr. checked no vacuume leaks.

It idles perfect for about 5 seconds, then drops so low until it's about to die, then idles good again..then drops.. it just keeps doing this.

** when the idle is dropping , there's smoke come out of the tail pipe, it's unburnt gas for sure, it smells just like gasoline.


timing is checked and but it shouldn't cause the weird idle right ?

ECU pulled 3 codes:

12 - MAFS (I'm using S14 KA MAF, don't have S13 dohc maf)
21 - Primary ignition circuit
32 - EGR system (removed egr, everything)

I thought the S14 KA MAF is the same as S13? the SAFC setting for both MAF are the same at least.