Why would a newish TBI run rich?

so my 87 yj 4.2 With Howell tbi threw codes 22 & 33, so I went ahead and replaced the Spark plugs, TPS, fuel filter, and MAP, to no avail I still have a rich issue, no smoke just gassy smell exhaust, bad mpg and a quiet Miss/sputter. the tbi was only installed 3years ago so things like the pump and regulator should be fine. I’ve tried moving the timing back and forth and it did not affect the miss/sputter at all. The spark wires and distributer were inspected and look clean. Any thoughts as to where to start? I’ve thought about getting a pressure/vacuum tester but now that the ecu isn’t throwing any codes it seems vacuum isn’t the problem either, I think

 

Welcome from north central West Virginia I’m wondering if maybe a plug wire even if they look good still may be breaking down

 

Thanks!!how would you test a spark wire?? Or rather what’s the resistance you would expect to see?

 

Some of our experts maybe will know more
But I was thinking breaking down when they get hot How old are the wires?

 

well the putter starts instantly so it’s not when hot, however I’ve been suspicious of the wires because they are from the previous owner but look fairly clean and new along with the distributor cap, but I’ll replace the spark wires to put that to rest, and I’ll let y’all know how that works out!!