Did a Ls swap in a 91 hatch did the mpfi swap Swapped the tps wires I've searche all over for an answer to this problem and could never find one that was quite the samw the same or had a answer so i started this one I belive the swap was out of a 91 I can't remember what the guy said exactly but did the mpfi started it and it was runnin real rough so we changed some vacuum lines around it was better put new plugs new wires swapped ecus I know the dizzy is good cuz I just had it on my friends Ls 2 days ago and it ran fine it fires up it bogs when u give it throttle like its unresponsive and it hits a rev limiter at like 3 or 4k I have no o2 sensor cuz I have a Apexi header with no bung for it and If I remember correctly I was throwing a code 4 if anybody could help me out I'd appreciate it I've done a few swaps and my buddy has done like 10 Ls swaps and were both almost out of options so plz somebody help

 

are you tuning with anything?sounds like a limp mode.also maybe check your map sensor.dont quote me

 

Nope no tuning but yea I'm thinking its limp too how do I fix that? Wire an o2? and the map sensor hasn't been touched since I bought the car but I'll check it out