I have a '88 NA rx7, racing beat full exhaust, K&N FIPK 13b 6 port engine.
Symptoms: stalling at idle, sluggish acceleration, sputtering, fuel smell from exhaust, when shut off hissing/ pressure leak sound from secondary injector area, fluxuating rpm while idleing.

what might be some troubleshooting steps to take, or possible causes. I've already changed spark plugs, all in right order and coils all have good spark, also changed at that time was a thermostat, all vacuum hoses connected and no visual leaks,

Just seems like its getting flooded, kinda rare for fuel injection, but thats what it seems like.