having problems with my sr20

[DawgMode]

wassup,a couple months ago i spun a rod bearing in my #3 cyl.....i pulled the motor, put in a new crank and changed all the rest of the bearings(except the main bearings).......now that it is back up and running and im having a few problems....A)the car is constantly back firing when i let off the throttle(but it doesnt stall out)B)i have this japanese fuel controller and the car breaks up(spudders) under hard Acceleration when i have it at factory settings...so in order for it to run properly i have to set it to almost full rich...whats wrong

i tried playing with the timing but i had no success

[Onizuka]

I'd say you should either get on a dyno or buy a wideband o2 sensor so you can see what is happening with your air/fuel ratios.

[hondahunter180]

my friends sr had the same sputtering problem under hard acceleration and it turned out to be vacuum lines in the wrong order. sence you have recently pulled your engine, i would go through and check for that.

[VitaminT]

I am guessing you have checked you timing and properly gapped your plugs?

[DawgMode]

im gonna change my plugs today and see what happens