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I'm having some serious problems with my truck.

It started out as rough idling and then it got worse. I have replaced all 4 O2 sensors, temperature sensor, knock sensor, distributor wires and cylinder 5 spark plug. It hasn't changed at all and still runs like crap. I've replaced cylinder 5 spark plug twice now. The electrode was burnt and the porcelain broke both times. Theres a bad knocking/pinging sound going on too.

The truck also wants to try to reach 260 on the temperature gauge. There's air in the cooling system and I don't know how to bleed it.

Also, I looked up how to test the EGR valve but it only showed symptoms of a bad EGR valve. My truck has all of them. But before I replace it I want to test it with a vacuum pump.

Can anyone tell me what else could be the problem? I've already spent $500 on parts. My list of problems was: catalytic convertors, EGR valve, computer, O2 sensors, monitors, 2 Inc, and other.

Help would be much appreciated. Thank you

I'm having some serious problems with my truck.

It started out as rough idling and then it got worse. I have replaced all 4 O2 sensors, temperature sensor, knock sensor, distributor wires, distributor and cylinder 5 spark plug. It hasn't changed at all and still runs like crap. I've replaced cylinder 5 spark plug twice now. The electrode was burnt and the porcelain broke both times. Theres a bad knocking/pinging sound going on too.

The truck also wants to try to reach 260 on the temperature gauge. There's air in the cooling system and I don't know how to bleed it.

Also, I looked up how to test the EGR valve but it only showed symptoms of a bad EGR valve. My truck has all of them. But before I replace it I want to test it with a vacuum pump.

Can anyone tell me what else could be the problem? I've already spent $500 on parts. My list of problems was: catalytic convertors, EGR valve, computer, O2 sensors, monitors, 2 Inc, and other.

Help would be much appreciated. Thank you

I'm having some serious problems with my truck.

It started out as rough idling and then it got worse. I have replaced all 4 O2 sensors, temperature sensor, knock sensor, distributor wires and cylinder 5 spark plug. It hasn't changed at all and still runs like crap. I've replaced cylinder 5 spark plug twice now. The electrode was burnt and the porcelain broke both times. Theres a bad knocking/pinging sound going on too.

The truck also wants to try to reach 260 on the temperature gauge. There's air in the cooling system and I don't know how to bleed it.

Also, I looked up how to test the EGR valve but it only showed symptoms of a bad EGR valve. My truck has all of them. But before I replace it I want to test it with a vacuum pump. Can anyone tell me what else could be the problem? I've already spent $500 on parts. My list of problems was: catalytic convertors, EGR valve, computer, O2 sensors, monitors, 2 Inc, and other.

Help would be much appreciated. Thank you

I'm having some serious problems with my truck.

It started out as rough idling and then it got worse. I have replaced all 4 O2 sensors, temperature sensor, knock sensor, distributor wires and cylinder 5 spark plug. It hasn't changed at all and still runs like crap. I've replaced cylinder 5 spark plug twice now. The electrode was burnt and the porcelain broke both times. Theres a bad knocking/pinging sound going on too.

The truck also wants to try to reach 260 on the temperature gauge. There's air in the cooling system and I don't know how to bleed it.

Also, I looked up how to test the EGR valve but it only showed symptoms of a bad EGR valve. My truck has all of them. But before I replace it I want to test it with a vacuum pump. 

Can anyone tell me what else could be the problem? I've already spent $500 on parts. My list of problems was: catalytic convertors, EGR valve, computer, O2 sensors, monitors, 2 Inc, and other.

Help would be much appreciated. Thank you