Uhhh, if it is blowing the vacuum caps off the brake booster then you must be getting a backfire through the intake. What is your timing set to? Is it hard to start sometimes?
its never been hard to start. thats why this is so strange. starts beautifully untill the caps come off then it runs like crap. i have never heard a backfire outof this beast but that doesn't mean anything... timing is set to 0* and if it is advanced or retarded at all it pings BIGTIME!!!!! ther it doesn't... thats how its been since i got it 2 years ago...