i have a 1990 mazda rx7 and the problem i am having is i am getting low vacuum i checked everyhose and all im getting is 15psi have anybody came across that

 

you mean 15 inches of mercury? 15psi is positive pressure.

you either have a leak somewhere, or a weak motor.

if your motor is street ported, 15 inches is ok

 

i checked it for leaks and there was none, i dont know if its street ported how can you tell

 

im getting the same problem only 15 lbs vacum its floods the rear rotor and wont idle but it has pleanty of power while crusing only up to forth gear. it boogs in fifth. but pulls hard in forth im trying to make sense of all of it. oh and getting about 8 miles a gallon

 

did it suddenly drop to 15 or has it always been that way?