on six lbs it should not be doing this....

my thoughts are..

your blowing your spark out..... as soon as your fmu sees boost from 1/2 to full its dumping a shit ton of pressure.

lower the gap on the plugs. back the distributor a bit to retard. and if at all possible lean out the fmu.

if your running a 12:1 fmu.... your not gonna get it to run right..

in order to run a fmu you need to be able to read a plug, and adjust the limited amount of mechanical crap that you can like. plug gap, ignition timing, fuel pressure, ect.

best advice is to get it chipped and tuned but, like i said 6psi and a fmu can work just fine. been there and done it.


what kind of fmu u got