Problem with Blazer Vortec

Greetings friends of the forum, I have a Chevrolet Blazer 4.3 Vortec in 1995, the problems is that the vehicle made a lot P0300b is obd1 but it brings OBD2 connector, I also got another computer and nothing, I lowered the engine and fixed it because I also made blue oil smoke, rectified head valves, change rings, change the Blok shirts, I put the engine rode and when the problem is going, it follows, excess black smoke and totally black spark plug Cylinder spark plug 5 gets wet from oil, a valve failure is heard to the engine and when I loosen the cylinder rockers 5 I match the same but when I squeeze them because they are fully failed the engine, I disassembled the head and seat of the valves with the insert in the head is very good, I have approximately 20 days with this problem and I do not know what else to do, I would like to do, I would thank you.

Look friend has a gasoline excess, so Smoum the bugs you have to check the MAP must be bad or the void hose is covered and the valve has the glued or very loaded shakes. Oil -filled spark plug is probable that it is the same oil that you placed when you arms and gosolina in excess because the valve does not serve because the clawblays are stuck or on loaded I hope my help serves you

Greetings friend, the problem has been solved, I settled valves again and changed the divers of the cylinder 5 that failed, the previous divers were overloaded very fast and from there the failure I had, let me tell you that according to the owner of the blazer, when I buy it he presented this failure and never had arranged it, thank you very much for their help which was very well.

Always to your order