just bought a 92 si hatch has a b18b bottom end and gsr head and transmission. i got a p72 ecu with it and when i start it up it runs fine at first and within like 5 mins of driving it starts driving totaly diffrent like it wont rev past 3500 and it makes a wierd sound when i do hit 3500 and it runs realy shitty and sounds like a lawn mower. any help with this one would be much appreciated

 

Any CEL codes. If so your ECU went into limp mode.

 

what codes is it throwing...

 

i dont know where do i check that sorry im new to this

 

there is a 2 wire plug by your ecu that you jump..... just search on it theres write ups over how and what 2 do and all the codes.