Hi, my name is andré and I own a 1992 Chevrolet c1500 pick up with a 305 v-8 and I am going through a problem with its idle, It idles really rough it sounds like I have an upgraded cam installed I checked the fuel pressure after I replaced the fuel filter it checked good I also replaced the rubber tube that connects to the pcv and it still idles really rough I need some help please!

 

Check your plugs and see if they are all burning evenly. If ya find some that are really black (rich) might have a inj prob or compression prob. Check your cap wires n rotor make sure they good and not shorting out. Corrosion bad. Also check for vac leaks. Broken lines or worn out vac line will cause rough idle. Make sure your not having an intake leak. Take some carb spray and spray around anything that could draw vac. If the engine revs when ya spray it on a certain place its a leak. Just some ideas