Running Lean or Rich?

Keep having problems, but now I was driving it and I can hit 5,000rpms in 1st, but then I was full throttle in 2nd and it started to cut out or kinda flicker at around 3500-3700, what the hell? Does this mean I am running Lean... also, my car is heating up... slowly, it has a new radiator, water pump, thermostat. Isn't that a sign that it could be running lean.. I have the regulator set at around 38-39psi and the timing is at 14*
 
are you sure it is not ignition related? you can hook up a FP gauge and watch it when your are taching out - if pressure drops, your pump or regulator are not up to par.

any codes? good luck.