i just got this car a week ago its a 89 iroc 350 tpi i did plugs ,cap,rotor reused wires still good but the motor still runs rough i found a vacume leak and replaced it it ran a little better but still runs rough what else could be causing this problem

 

the motor sends no check engin code could it be the maf

 

what about a new airfilter,just a thought.(could be plug wires or coil)
when i got mine i went through all this stuff i wasnt satisfied with it untill i cleaned my throttle blades,new accelerator cable, and set my TPS that made my car jump off the line and idle better.

im still new at this no expert for sure but these things fixed me up!!