While my car is at idle or low rpm and I step on it, it severely falls on its face for a second, then revs. I have a Walbro 255HP fuel pump, stock fpr, ZEX plugs, NOS NOSzzle direct port nitrous(NOT using at idle), and timing retarded slightly. I couldn't tell exactly where I was timing this bastard, could only see the red mark(16) and white mark(TDC) so I guessed where 3 degrees was. Anyone know if this is a timing/cold plug issue or fuel issue? Maybe a NOSzzle issue?

 

could be a vacume leak any fumes maybe to much fuel bogging the motor....

 

Good call, I have been thinking that since I originally had a bad leak around NOSzzles. modified fuel rail brackets and tightened and thought I had the vacum prob fixed. Tried starting fluid on the NOSzzles and idle didn't change so I thought I was good. How can I narrow it to a vacum leak/find the leak? I had a lot of stuff apart.