I just got a swap done in my teg just a stock obd2 LS. The problem is it wont rev over 3k and sometimes it does. Everything is stock besides headers and intake but besides that I am running a obd2-1 harness with a obd1 ecu wont this cause the problem or no? BTW it isnt throwing any codes as well.

 

check the oil, sometimes when the oil is low vtec wont engage, but this seems kinda odd...

 

i never said anything about vtec lol its an ls

 

haha i think you were the one i wanted to buy the gsr gead off of...
anyhow i believe it is your timing

 

i never said you had vtec, I said soemtimes when vtec wont engage its due to low oil. perhaps your car has low oil and wont allow you to rev past 3k rpm?

have you checked your oil? when was the last time you had it changed?

or maybe you dont have enough pressure to press the gas pedal all the way down?

 

its weird sometimes it revs past 3k and other times it doesnt oil is good

 

yea you could always check your throttle cable....
if not timing make sure your grounds are good if it is an on and off thing