I bought a 91 K5 i knew it needed work so i started with Replacing both fuel lines, spark plugs and rebuilt the throttle body. The truck ran (rough)before I did all this work but after wouldn't start! I also had a bad oil leak so I decided to fix that in the mean time. I found out that there was gas in oil. I asked the guy at a local shop about it and he told me to do an oil change, that the gas may have gotten in the oil by trying to start it too much. So I did and it almost started. It cranks strong but doesn't turn over. Can anyone lead me in the right direction?