Hey, my name is John Lee and I would like to start off by saying I am a huge fan and have been watching your videos for a while now. I also have a huge problem and I really hope you can answer or help me to solve my problem.
The problem goes as follows.
I was given my grandmothers truck after her passing last summer, which I've always wanted it since I was little. It is a 1997 Chevy C1500 silverado with a 5.7L Vortec 350. I had the transmission rebuilt as soon as I received it, but the engine still ran amazing. After several months I needed to replace my entire distributor. I proudly did it myself and ended up getting the timing off by a few teeth. I took it to a mechanic to adjust the timing and when I got it back it was misfiring. At first it was a random misfire. I cleaned my egr valve with carb cleaner and this lead it to only misfire on cylinder 5. Then I replaced the spark plugs, spark plug wires, and ignition coil. The problem persisted with even my best efforts and a great deal of research. After that I kept trying and ended up replacing the spider fuel injectors with the more updated multi port injectors. This did not make a difference and my truck has been running rich for months now and is burning out my O2 sensors. I am lost and confused with no sense of direction. I really hope you can help me because I really need it.