need help diagnosing a problem???
 

i just recently bought a 1981 rx7 gsl when i bought the car it seemed to run fine but it had a leak in the water pump housing....i replaced the water pump and had to take off the air pump cuz i broke the adjusting bolt but i fixed that and put the air pump back on and while doing that i broke the blue relief silanoid valve by leaning on it.... i went to to the junk yard and found a new one to replace it but now the car will not idle and i get a little bit of backfireing ...... Does anyone know what might be wrong??