#6215, "RE: BIG BACK FIRE....1997 gsx" In response to In response to 3
Well, this might or might not help, but judging from the vac gauge, and large "pop" sound, you might have had an intercooler pipe come off. i'd do a boost Leak Test or at least look everything over. It could explain the richness aswell. the car is still seeing the air enter the motor even though its not actually making it into the engine.