2001 blazer zr2. New distributor cap rotor new water pump new cts new fuel filter will start sometimes and sometimes not. If it does start and I try to hit the accelerator will bog out and die. Also has a brand new spider in it and all new gaskets. I get a multi miss fire code, baro code, mass air flow code, not sure what else to do....

 

The distributor cap is new, what about the the distributor itself? Not to say "new" is good, but the distributor could be worn as to cause this problem.

 

the whole distributor unit is new

 

Fuel pump???