Running bad

I have a 1991 chevy 1500 350 engine 189,000 miles it had a miss to it when the motor warms up and when you come to a stop it runs real rough. Somtimes it runs great all day then sometimes it's real bad I changed the coil, plugs, cap, button. Wires. Did not help at all it has hardley no power and now its starting to smell like raw fuel.I done a compression test I had 5, at 180, 2, at, 155, and 1, at, 135 I can not figure it out because of the run good somtimes run bad other times so please help. Thank you in advance for your time