Ok when the car is idleing it seems to run fine,but when you go down the road and give it a little gas the car starts to jerk and it seems to studder and it backfires some times.And it don't do it at the same rpm.One time it barely made it up a small hill.Now I just put the motor back in I had it bored and sleeved and changed the compresion and ported and polished the head and new vemon injectors and it's supercharged.so can somebody help me.

 

Check timing, TPS, fuel pressure...

Did you get it tuned at all?????

 

timing looks to be good and the fuel pressure is like at 100pounds

 

lbs?...What is that in psi? Should be near 40-45 psi...probably more for your setup