85 irock z 305 tpi replaced wires plugs pcv valve massair flow sensor still runs a little ruff. will not having a muffler make it run ruff?
im going to get muffler this weekend.

Did it run rough when you had a muffler on it? I know my 4.3L s-10 runs rough without it. Did you check the engine for timing by chance?

bought the car with no muffler car had a cuple of issues fixed every thing but muffler this weekend i will install new one and let you know thanks

Check timing on the motor too.